20181150296Design Optimization of Ceiling Fan Blades with Nonlinear Sweep Profile 22This study pertains to the design optimization of a four-blade ceiling fan to enhance air circulation and energy efficiency. The sweep angle of the blade profile is nonlinear. The design of experiment (DOE) computational fluid dynamics (CFD) and response surface method (RSM) methods were used in parallel to find the optimal design solution. The design variables considered were inboard angle of attack, outboard angle of attack, blade sweep, and tip-chord length. Numerical simulations were conducted using steady state Reynolds-averaged Navier–Stokes (RANS) equations and the Spalart–Allmaras turbulence model. The baseline results were validated through experimental data. Subsequently, the DOE method was employed to generate the blade design which reduce the number of simulations without losing the influence of different geometric parameter interactions. The response variables studied were volume flow rate, mass flow rate, torque, and energy efficiency. The simulations exhibited that flow pattern has a distinct feature and is further classified into three groups. In the end, the optimal blade design was identified using response surface methodology (RSM). 11531162E.AdeebSchool of Mechanical Engineering, Kyungpook National University, Daegu 702-701, South KoreaSchool of Mechanical Engineering, Kyungpook National University, Daegu 702-701, South Koreapaysehsan_adeeb@hotmail.comC. H.SohnSchool of Mechanical Engineering, Kyungpook National UniversitySchool of Mechanical Engineering, Kyungpook National Universitypayschsohn@knu.ac.krA.MaqsoodResearch Centre for Modeling & Simulation, National University of Sciences and Technology, Islamabad 44000, Islamic Republic of PakistanResearch Centre for Modeling & Simulation, National University of Sciences and Technology, Islamabad 44000, Islamic Republic of Pakistanpaysadnan@rcms.nust.edu.pkM. A.AfaqInstitute of Applied Mathematics, Technical University Dortmund, Dortmund 4427, GermanyInstitute of Applied Mathematics, Technical University Dortmund, Dortmund 4427, Germanypaysaaqib.afaq@math.tu_dortmund.deNonlinear sweep Design of experiments Blade design Computational fluid dynamics Response surface method.[Adeeb. E., A. Maqsood, A. Mushtaq and Z. Hussain (2015). Shape Optimization of non-linear swept ceiling fan blades through RANS simulations and Response Surface Methods. 12th International Bhurban Conference on Applied Sciences and Technology, IEEE.##
Adeeb. E., A. Maqsood, A. Mushtaq (2015). Effect of number of blades on performance of ceiling fans. 4th International Conference on Advances in Mechanics Engineering, IEEE.##
Adeeb. E, A. Maqsood, A. Mushtaq and C.H. Sohn (2016). Parametric study and optimization of ceiling fan blades for improved aerodynamic performance. Jouranl of Applied Fluid Mechanics 9(6), 2905-2916. ##
Afaq, M. A., A. Maqsood, K. Parvez and A. Mushtaq (2014). Study on the design improvement of an indoor ceiling fan. 11th International Bhurban Conference on Applied Sciences and Technology, IEEE.##
Afaq, M. A., A. Maqsood, Butt. S. I., Tauqeer. T., and Hassan, A., (2017). Aerodynamic investigation and redesign of ceiling fan blades for enhanced energy efficieny. Majeo International Journal of Science and Technology 11(02), 97-114.##
Ankur. J., Rochan. R. U., Samarth. C., Manish. S, and Sunil. K. (2004). Experimental Investigation of the Flow Field of a Ceiling Fan. ASME 2004 Heat Transfer/Fluid Engineering Summer Conference, Charlotte, North Carolinia, USA.##
Makhoul, A., Ghali, K., and Ghaddar, N. (2013), Desk fan for the control of the convection flow around occupants using ceiling mounted personalized ventilation. Buildings and environment 59, 336-348.##
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]Numerical Simulation of Mucus Clearance inside Lung Airways 22Airway mucus is difficult to clear and to improve lung function clearance of mucus is necessary. The deep coughing, chest physiotherapy, high frequency chest wall oscillation etc. are some of the best methods to clear excessive mucus from lung airways. In this article we analysed the behavior of fluid flow between parallel walls , where both walls are porous and the flow is induced by the oscillation of these walls and pressure gradient; which is applicable for clearance of mucus from lung airways. Generalized couette flow is applicable to model the oscillation of parallel walls, however the laminar flow of viscous fluid is taken under consideration. The generalized Navier-Stokes equations are applied to make various hypotheses and finite difference scheme is used to solve the problem numerically. Effect of wall oscillation, wall porosity, pressure due to porous media on mucus clearance and particle aspect ratio on the deposition of nonspherical nanoparticles are analysed graphycally after simulating the problem on MATLAB R2013a by user defind code. Simulation show an excellent agreement of unsteady flow of viscous fluid at large values of time and significant correlation between pressure gradient and porosity of walls, frequency of wall oscillation and their imapct on mucus clearance are obtained. In addion it is observed that fluid and particle velocity are increased with the enhancement of media porosity, breathing frequency and aspect ratio. The aim of this paper is to study the influence of wall movement, wall porosity, pressure on wall, wall oscillating frequency on the clearance of mucus from lung airways. 11631171J.KoriDepartment of Mathematics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, IndiaDepartment of Mathematics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, Indiapaysjyotikorii@gmail.com.PratibhaDepartment of Mathematics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, IndiaDepartment of Mathematics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, Indiapayspratibhag@rediffmail.comCilia movement Couette flow Mathematical modeling Mucus clearance Porosity Particle shape. [Chang, H., M. Weber, and M. King (1988). Mucus transport by high pusle rate non symmetrical oscillatory air flow. Journal of Applied Physiology 65(3), 1203–1209.##
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]Effect of Turbulent Uniform Flow past a Two- Dimensional Square Cylinder 22Turbulent uniform flows past a two-dimensional square cylinder are investigated numerically. By varying the turbulence intensity and turbulence length scale of the approaching flow, the flow effect of the cylinder are compared to that in a laminar approaching-flow case. In addition, the variations of drag and lift coefficients with respect to the changes of turbulence intensity and turbulence length scale are analyzed on a systematic basis. In the large eddy simulations, the approaching-flow turbulence is generated by a spectral method according to Kármán spectrum. Two levels of turbulence intensities (5% and 10%) and three turbulence length scales (0.25, 0.50 and 1.0 times of the cylinder width) are selected in the study to examine the effect on the cylinder. Results show that the Strouhal number remains almost unchanged when the uniform approaching-flow changes from a laminar state to a turbulent one. The approaching-flow turbulence has noticeable effect in promoting the resulting drag and lift fluctuations. However, its effect on the mean drag appears negligible. In contrast, an increase of the approaching-flow turbulence length scale leads to mild increases of the mean and root-mean-square values of drag. On the other hand, the resulting lift fluctuation is insensitive to the change of the turbulence length scale. 11851192Y. C.LiWind Engineering Research Center, Tamkang University, New Taipei City, 251, TaiwanWind Engineering Research Center, Tamkang University, New Taipei City, 251, Taiwanpaysliyichao223@gmail.comC. Y.ChungAerospace Science and Technology Research Center, National Cheng Kung University, Tainan, 711, TaiwanAerospace Science and Technology Research Center, National Cheng Kung University, Tainan, 711, Taiwanpaysslaterlieyou@gmail.comF. M.FangDepartment of Civil Engineering, National Chung Hsing University, Taichung, 402, TaiwanDepartment of Civil Engineering, National Chung Hsing University, Taichung, 402, Taiwanpaysfmfang@nchu.edu.tw Turbulent approaching flow Square cylinder Large eddy simulation. [Basara, B. and Younis, B. A. (1992). Progress in the prediction of turbulent wind loading on buildings. Journal of Wind Engineering and Industrial Aerodynamics 41-44, 2863-2874.##
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]Numerical Visualization of Blast Wave Interacting with Objects22Blast wave interaction with objects has gained attention due to military conflict and terrorist attack across the globe. Blast wave attenuating and mitigating structures are needed to be developed to protect the military vehicles and commercial buildings. In order to understand the attenuating mechanism such as the dissipation and dispersion along with the secondary effects, the blast wave interacting with three objects is examined in the present study for the diaphragm pressure ratio of 56. Here, the blast wave is generated in a short driver section open ended shock tube by solving the Euler equations using the commercial software ANSYS Fluent. It has been observed that the circular disc attenuates the blast wave more effectively compared to the cone and sphere for the same frontal area. The attenuation was lowest in the sphere and maximum in the circular disc. However, the loads acting on the sphere was more compared to the conical object. The peak load acting on the circular disc was 2.09 times more compared to the peak load acting on the conical object (cone angle 26.5°) with the same hydraulic diameter. 12011206S.DeyAcademy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur- 713209, IndiaAcademy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur- 713209, Indiapaysmesantanudey@yahoo.comT.MuruganAcademy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur- 713209, IndiaAcademy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur- 713209, Indiapaysmurugan.thangadurai@gmail.comD.ChatterjeeAcademy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur- 713209, IndiaAcademy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur- 713209, Indiapaysrsdchat@yahoo.co.inBlast wave Shock tube Computational fluid dynamics Blast wave attenuation Shock loads on structures. [ANSYS Workbench User's Guide (2010). Release 13.0, ANSYS Inc., Canonsburg, PA.##
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]Numerical Simulation of the Non-Isothermal Co-Extrusion Fiber Spinning with Flow-Induced Crystallization 22In this work, the numerical simulation of the non-isothermal steady co-extrusion fiber spinning with flow-induced crystallization is explored. The model is based on the formulation originally proposed by China et al. in which Newtonian and Phan-Thien-Tanner (PTT) fluids are considered the core and the skin layer, respectively. The polymeric flow rate fraction, Deborah dimensionless number and the PTTs parameters on the temperature, the velocity and the crystallization profiles are analyzed. The numerical results show: the temperature profile is sensitive to the polymeric layer flow rate and the deformation parameters (shear thinning and extensional), the tensile stress induced crystallization parameter has a strong influence at the onset of the process, increasing drastically temperature and crystallinity. 12071215B. E.GarcíaFacultad de Estudios Superiores Zaragoza, UNAM, Batallón del 5 de Mayo s/n, esquina Fuerte de Loreto, Col. Ejercito de Oriente, Delegación Iztapalapa, C. P., 09320, Ciudad de México, MexicoFacultad de Estudios Superiores Zaragoza, UNAM, Batallón del 5 de Mayo s/n, esquina Fuerte de Loreto, Col. Ejercito de Oriente, Delegación Iztapalapa, C. P., 09320, Ciudad de México, Mexicopaysiqblanca@comunidad.unam.mxA.ZacaríasESIME Azcapotzalco, Instituto Politécnico Nacional, Avenida de las Granjas No. 682, Colonia Santa Catarina, Delegación Azcapotzalco, Ciudad de México, 02250 MexicoESIME Azcapotzalco, Instituto Politécnico Nacional, Avenida de las Granjas No. 682, Colonia Santa Catarina, Delegación Azcapotzalco, Ciudad de México, 02250 Mexicopaysazacarias@ipn.mxV.FerrerESIME-Zacatenco, Instituto Polit´ecnico Nacional, U.P. Adolfo López Mateos, Col. Lindavista, Del. Gustavo A. Madero, Ciudad de México,ESIME-Zacatenco, Instituto Polit´ecnico Nacional, U.P. Adolfo López Mateos, Col. Lindavista, Del. Gustavo A. Madero, Ciudad de México,paysvferrerl1400@alumno.ipn.mxR. O.VargasESIME-Azcapotzalco, Instituto Polit´ecnico Nacional, Av. de las Granjas 682, Col. Santa Catarina, Del. Azcapotzalco, Ciudad de MéxicoESIME-Azcapotzalco, Instituto Polit´ecnico Nacional, Av. de las Granjas 682, Col. Santa Catarina, Del. Azcapotzalco, Ciudad de Méxicopaysreneosvargas@yahoo.com.mxPolymer processing PTT model FIC. [Beris, A. and B. Liu (1988). Time-dependent fiber spinning equations 1. analysis of the mathematical behavior. Journal of Non-Newtonian Fluid Mechanics 26(-), 341361.##
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Bhadauria, B. S., I. Hashim, and P. G. Siddheshwar (2013). Study of heat transport in a porous medium under g-jitter and internal heating effects. Transport in Porous Media 96(1), 21–37.##
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Kuznetsov, A. V. (2006a). Investigation of the onset of bioconvection in a suspension of oxytactic microorganisms subjected to high frequency vertical vibration. Theoretical and Computational Fluid Dynamics 20(2), 73–87.##
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Zobel, R. (1936). Experiments on a hydraulic reversing elbow. Mitt Hydr Inst Munich, 8, 1-47. ##]Development of the Couple Stress Relationships for the Power Law Fluid and the Solution of Flow in Ceramic Tape Casting Process 22The absence of characteristic material length in the Navier-Stokes equations has led to the development of different couple stress theories. In the present study, for the first time, the relations of a couple stress theory are extended to power-law fluids. Moreover, considering the significance of the length scale in nano- and micromechanics, the relations of the extended theory were applied to Newtonian and power-law fluids in tape casting of ceramics. The obtained velocity was used to calculate the volumetric flow rate as well as the thickness of the ceramic tape. A comparison between the results of the Newtonian fluid and the analytical and experimental results indicated a close agreement between the present results and the results of other studies. Moreover, the tape thickness was obtained for different length scales (L) by numerically solving the velocity relations obtained for the non-Newtonian fluid. Also, the impact of casting speed on the tape thickness was shown for four power-law fluids assuming L=0.35. 12391246F.KaramiEngineering Faculty, Shahrekord University, Shahrekord, IranEngineering Faculty, Shahrekord University, Shahrekord, Iranpaysfatemeh2201@gmail.comA.Ahmadi NadooshanEngineering Faculty, Shahrekord University, Shahrekord, IranEngineering Faculty, Shahrekord University, Shahrekord, Iranpaysahmadi@eng.sku.ac.irY.Tadi BeniEngineering Faculty, Shahrekord University, Shahrekord, IranEngineering Faculty, Shahrekord University, Shahrekord, Iranpaystadi@eng.sku.ac.irCouple stress tensor Characteristic material length Non-Newtoinian fluid Tape thickness. [Ansari, R., R. Gholami, A. Norouzzadeh, and S. Sahmani (2015). Size-dependent vibration and instability of fluid-conveying functionally graded microshells based on the modified couple stress theory. Microfluidics and Nanofluidics 19, 509-522.##
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]Experimental and CFD Study of Internal Flow inside a Sessile Microdroplet undergoing Lateral Vibration 22In this study, the internal flow pattern of a sessile microdroplet undergoing a lateral vibration was analyzed by using both the experimental and CFD simulation methods. By initially staining the droplet partially with fluorescent dye, the main flow inside the laterally vibrating microdrop was experimentally demonstrated to be that the main fluid flows downward along the central axis and ascends upward along the surface to form two counterflow circuits. Experimental evaluation of fluid mixing inside the droplets verified that the internal flowing velocity is dependent on the vibrating frequency, the main fluid flows faster at the resonant modes. CFD simulation using the VOF-CSF model showed that extra flow circuits exit inside the oscillating droplet besides the main flow. The diffusion of substrate momentum within the Stokes layer results in the two flow circuits near the bottom substrate, and the Laplace force due to the droplet deformation induces the two counter-current flow circuits near the surfaces of the microdroplet.
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]A Novel Method (T-Junction with a Tilted Slat) for Controlling Breakup Volume Ratio of Droplets in Micro and Nanofluidic T-Junctions22We propose a novel method for producing unequal sized droplets using a titled slat in the center of a T-junctions. In the available methods for generating unequal-sized droplets such as T-junction with valve and T-junction with a heater, the minimum breakup volume ratio that is accessible is approximately 0.3 while the system of this paper can generate droplets with the volume ratio 0.05. Therefore, the manufacturing cost of the system decreases considerably because it does not need to the consecutive breakup systems for generation of small droplets. The employed method was investigated through a numerical simulation using the volume of fluid (VOF) algorithm. The simulation results are reported for micro and nano-scaled T-junctions in various tilted slat sizes, capillary numbers (a dimensionless group describes the ratio of the inertial forces to the surface tension forces) and slat angles. Our method decreases (increases) considerably the breakup time (speed of the breakup process). For example in the case Ca=0.1 and volume ratio 0.4, dimensionless breakup time of our method and the method of T-junction with valve are 0.25 and 3.6, respectively. The results revealed that the breakup length of the nanoscale T-junction is smaller than microscale and increases by increasing the slat angle in both scales. The results demonstrated the breakup volume ratio decreases by increasing the tilted slat length. Also the breakup volume ratio minimizes in a specific slat angle. The results showed the breakup time is reduced by decreasing the slat angle. We also found that the pressure drop of the system is almost independent of the system geometry.12551265A.Kiani MoqadamDepartment of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, IranDepartment of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iranpaysalireza.kiani.m@live.comA.BedramFaculty of Imam Ali, South Khorasan Branch, Technical and Vocational University (TVU), Tabas, IranFaculty of Imam Ali, South Khorasan Branch, Technical and Vocational University (TVU), Tabas, Iranpaysbedram@chmail.irM. H.HamediDepartment of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, IranDepartment of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iranpayshannani@chmail.ir Unequal droplets T-junction Tilted slat Numerical simulation VOF Nano 3D. [Bai, L., Y. Fu, S. Zhao and Y. Cheng (2016). Droplet formation in a microfluidic T-junction involving highly viscous fluid systems. Chemical Engineering Science 145, 141.##
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]Experimental Investigation of Flow Control over an Ahmed Body using DBD Plasma Actuator 22Ahmed body is a standard configuration of road vehicles and most of the studies of automobile aerodynamics are performed based on it. In this paper, the plasma actuator was used as an active flow control method to control the flow around the rear part of the Ahmed body with the rear slant angle of 25°. Experiments were carried out in a wind tunnel at two different velocities of U=10m/s and U=20m/s using steady and unsteady excitations. The hot-wire anemometer was used to measure the vortex shedding frequency at the downstream of the body. Pressure distribution was measured using 52 sensors and total drag force was extracted with a load cell. Furthermore, smoke flow visualization was employed to investigate the flow pattern around the body. The results showed that the plasma actuator was more effective on the pressure distribution and total drag force at the velocity of U=10m/s. In fact, by applying steady and unsteady excitations there was 7.3% and 5% drag reduction; respectively. While at the velocity of U=20m/s; the actuator had no significant effect on pressure distribution and total drag. As a remarkable result, the plasma actuator, especially in the steady actuation, has demonstrated its effectiveness on dispersing the longitudinal vortices and suppressing the separated flow on the rear slant at low velocities. 12671276S.ShadmaniDepartment of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, IranDepartment of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iranpaysshadmani.sh@wtiau.ac.irS. M.Mousavi NainiyanDepartment of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, IranDepartment of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iranpaysmousavi.mojtaba@wtiau.ac.irM.MirzaeiDepartment of Aerospace Engineering, K. N. Toosi University of Technology, Tehran, IranDepartment of Aerospace Engineering, K. N. Toosi University of Technology, Tehran, Iranpaysmirzaei@kntu.ac.irR.GhasemiaslDepartment of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, IranDepartment of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iranpaysghasemiasl.r@wtiau.ac.irS. G.PouryoussefiDepartment of Aerospace Engineering, K. N. Toosi University of Technology, Tehran, IranDepartment of Aerospace Engineering, K. N. Toosi University of Technology, Tehran, Iranpaysgh.pouryoussefi@dena.kntu.ac.ir Automotive Aerodynamics Wind tunnel Drag reduction. [Ahmed, S. R., G. Ramm, and G. Faitin (1984). Some salient features of the time-averaged ground vehicle wake. SAE Technical Paper 840300. ##
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]Optimization of Convective Heat Transfer from Two Heating Generators into Horizontal Enclosure Including A Discrete Obstacle: A Lattice Boltzmann Comprehensive Investigation22This paper is intended to address the effect of a discrete obstacle on the behavior of flow and heat transfer of laminar natural convection in horizontal enclosure heated from below and symmetrical cooled from sides. Horizontal walls of the enclosure are considered adiabatic except the obstacle. Heating generators of a rectangular form and localized symmetrically are heated at a same uniform temperature. The cold obstacle is placed between active generators that create two thermal plumes. The double population lattice Boltzmann with standard models D2Q9 and D2Q4 for flow and temperature is used to simulate the problem. Prandtl number (Pr), Grashoff number (Gr) and aspect ratio of the enclosure (A) are fixed to 0.71, 105 and 2, respectively. Computational results are performed for pertinent geometric parameters of the obstacle in the following ranges: height 0 ≤ HO ≤ 0.75, position 0 ≤ XCO ≤ 0.5 and length 0.1 ≤ LO ≤ 0.6. It is found that predicted results with LBM are in line with previous investigations. Simulations show that adding the obstacle inside an enclosure conduct to change considerably the thermo-fluid characteristics. Hence, increasing the obstacle height causes a destruction of the interference between thermal plumes. On the other hand, optimum of heat transfer is discovered for a centred obstacle (XCO = 0) and for smaller length and greatest height of this one. 12771286T.NaffoutiUniversity of Tunis El-Manar, Faculty of Sciences of Tunis, Department of Physics, TunisiaUniversity of Tunis El-Manar, Faculty of Sciences of Tunis, Department of Physics, Tunisiapaystaoufiknaffouti@gmail.comL.ThamriUniversity of Tunis El-Manar, Faculty of Sciences of Tunis, Department of Physics, TunisiaUniversity of Tunis El-Manar, Faculty of Sciences of Tunis, Department of Physics, Tunisiapaysthamril@yahoo.frA.NaffoutiUniversity of Tunis El-Manar, Faculty of Sciences of Tunis, Department of Physics, TunisiaUniversity of Tunis El-Manar, Faculty of Sciences of Tunis, Department of Physics, Tunisiapaysawatefnaffouti84@gmail.comJ.ZinoubiLaboratory of Energizing and Thermal and Mass Transfers, El Manar 2092, Tunis, TunisiaLaboratory of Energizing and Thermal and Mass Transfers, El Manar 2092, Tunis, Tunisiapaysznbijmil@gmail.comLattice Boltzmann method Convective heat transfer Horizontal enclosure Discrete obstacle Optimization of heat transfer.[Aydin, O., J. Yang, (2000), Natural convection in enclosure with localized heating from below and symmetrically cooling from sides, International Journal of Numerical Methods of Heat and Fluid Flow. (10), 518-529.##
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]Accuracy of Dynamic Stall Response for Wind Turbine Airfoils Based On Semi-Empirical and Numerical Methods 22The aim of the present study is to investigate the accuracy of two different dynamic stall approaches for wind-turbine airfoils. The first approach is the semi-empirical Leishman-Beddoes model (L-B), and the second is the computational fluid dynamic (CFD) results. National Renewable-Energy Laboratory (NREL) S series airfoils are used, and the simulations are performed in Re=106. For both approaches, aerodynamic coefficients are represented and compared to experimental data. Validation data refer to Ohio State University (OSU) experiments, which are for pitch oscillation. Results show that the accuracy of the L-B and CFD methods is dependent on mean angle of attack, reduced frequency and the phase of motion. The semi-empirical model has appropriate accuracy as well as low computational cost while the CFD unsteady simulation could be properly used to predict the drag coefficient. 12871296S.RasekhDepartment of Aerospace Engineering, Tarbiat Modares University, Tehran, IranDepartment of Aerospace Engineering, Tarbiat Modares University, Tehran, Iranpayssepehrrasekh72@gmail.comM.Hosseini DoustDepartment of Aerospace Engineering, Tarbiat Modares University, Tehran, IranDepartment of Aerospace Engineering, Tarbiat Modares University, Tehran, Iranpayshosseinidoust.m@modares.ac.irS.KarimianDepartment of Mechanical Engineering, Tarbiat Modares University, Tehran, P.O.B. 14115-111, IranDepartment of Mechanical Engineering, Tarbiat Modares University, Tehran, P.O.B. 14115-111, Iranpayskarimian@modares.ac.ir Dynamic stall Wind turbine airfoils Semi-Empirical model Numerical method.[Butterfield, C. P. (1988). Aerodynamic pressure and flow-visualization measurement from a rotating windturbine blade, Solar Energy Research Inst., Golden, CO (USA).##
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]Experimental and Numerical Study of a Submarine and Propeller Behaviors in Submergence and Surface Conditions 22In this paper, hull/propeller interaction of a submarine model which has a realistic geometry, in submergence and surface conditions has been studied. For this purpose, the computational fluid dynamics (CFD) method has been used to solve the viscous, incompressible, two phase flow field (in surface condition) around a model of the propeller and submarine hull with and without propeller. The rotation of the propeller has been modeled using the sliding mesh technique. For turbulent flow modeling and free surface simulation, the k-ω SST model and the volume of fluid method (VOF) have been used, respectively. Experimental data obtained from test conducted by the authors in M.U.T. towing tank have been used to validate the numerical scheme. Comparing numerical and experimental results shows good agreement. The experimental and numerical results show that operation of the propeller near water surface reduces the thrust coefficient of the propeller comparing to open water condition, so that according to experimental results the maximum relative reduction of the thrust coefficient is 8.95%. In addition, the results indicated the amount of hull resistance coefficient in surface condition is more than submergence condition. According to the thrust reduction and wake factors obtained from the numerical results, it is known that their values in surface condition are less than submergence condition. This research can be used for more realistic investigation of hull/propeller interaction and thus, more accurate powering performance prediction of submarines. 12971308A.ValiDepartment of Hydrodynamic Research Center, Malek-e Ashtar University of Technology, Shiraz, IranDepartment of Hydrodynamic Research Center, Malek-e Ashtar University of Technology, Shiraz, Iranpaysab_vali@yahoo.comB.SaranjamDepartment of Naval Engineering, Malek Ashtar University of Technology, Shiraz 71855465, IranDepartment of Naval Engineering, Malek Ashtar University of Technology, Shiraz 71855465, Iranpaysb_saranjam@yahoo.comR.KamaliDepartment of Mechanical Engineering, Shiraz University, Shiraz, I. R. of IranDepartment of Mechanical Engineering, Shiraz University, Shiraz, I. R. of Iranpaysrkamali@shirazu.ac.irTwo phase flows Hull/propeller interactions CFD Sliding mesh Volume of fluid (VOF) method. [Bernitsas, M. M., D. Ray, and P. Kinley (1981). KT, KQ and efficiency curves for the wageningen b-series propellers. Report No. 237, Department of Naval Architecture and Marine Engineering, Michigan University.##
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]Experimental Study on the Effects of Water-in-oil Emulsions to Wall Shear Stress in the Pipeline Flow 22Study on the emulsion formation mechanically and relate the effect of emulsions to the friction or wall shear stress ( ) in the pipeline flow has not yet been explored. So, this study aims to understand the emulsions formation mechanically and to discover the effects of water-in-oil emulsions to the pipeline flow transport by relating the effect of emulsions to the wall shear stress or friction of the pipe. In this study, wall shear stress is compared at water cuts from 0% to 40%, Reynolds number that covers laminar (1100 < Re < 1800) and transitional (2400 < Re < 2800) flow regime, pipeline constrictions that consists of gradual and sudden contraction with a contraction ratio of 0.50 and 0.75, respectively as well as along the pipelines. To carry out the experiments, the Ultrasonic Velocity Profiler and a lab-scale flow rig were used. The results show that the maximum wall shear stress happens at 10% water cuts, higher Reynolds number results in lower wall shear stress, pipeline constriction with contraction ratio of 0.75 results in higher wall shear stress than the contraction ratio of 0.50 and sudden constriction results in higher wall shear stress than the gradual constriction, and wall shear stress increases with the increase in the length of the pipeline downstream the pipeline constriction. In conclusion, pipeline flow with higher Reynolds number and pipeline constriction (which represents the usage of choke valve in the industries) type gradual constriction ratio 0.50 are recommended to be used in the oil and gas industries because this combination results in the lowest wall shear stress
13091319S. S.DolDepartment of Mechanical Engineering, College of Engineering, Abu Dhabi University, P. O. Box 59911, Abu Dhabi, UAEDepartment of Mechanical Engineering, College of Engineering, Abu Dhabi University, P. O. Box 59911, Abu Dhabi, UAEpayssharulshambin.dol@adu.ac.aeS. F.WongDepartment of Petroleum Engineering, Faculty of Engineering and Science, Curtin University Malaysia, CDT 250, 98009 Miri, Sarawak MalaysiaDepartment of Petroleum Engineering, Faculty of Engineering and Science, Curtin University Malaysia, CDT 250, 98009 Miri, Sarawak Malaysiapayssiewfan90@gmail.comS. K.WeeDepartment of Petroleum Engineering, Faculty of Engineering and Science, Curtin University Malaysia, CDT 250, 98009 Miri, Sarawak MalaysiaDepartment of Petroleum Engineering, Faculty of Engineering and Science, Curtin University Malaysia, CDT 250, 98009 Miri, Sarawak Malaysiapayswee.siaw.khur@curtin.edu.myJ. S.LimPETRONAS Carigali, PCSB Building, Jalan Sekolah, 98100 Lutong Miri, Sarawak, MalaysiaPETRONAS Carigali, PCSB Building, Jalan Sekolah, 98100 Lutong Miri, Sarawak, Malaysiapayslimjitsen@petronas.com.myWater-in-oil Emulsions Wall shear stress Friction Emulsification Pipeline flow. [Abiev, R. S. and M. P. Vasilev (2016). Pulsating flow type apparatus: Energy dissipation rate and droplets dispersion. Chemical Engineering Research and Design 108, 101-108.##
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]A Study on the Effect of Peristalsis and Cilia of MHD Micropolar Fluid Flow through an Inclined Porous Channel 22The study of the influence of magnetic field, channel inclination, porous medium and cilia on the Micropolar fluid under different boundary conditions is carried out. The methods of solving Navier Stokes equation specific to Micropolar fluid under the joint influence of these effects are presented. The profiles of velocity (along the flow direction), the micro rotation vector and the variation of pressure rise with time average flow rate for fixed values of other parameters were carried out and the results are discussed. 13211331S. V. H. N.Krishna Kumari. PDepartment of Mathematics, Koneru Lakshmaiah Educational Foundation, Hyderabad, IndiaDepartment of Mathematics, Koneru Lakshmaiah Educational Foundation, Hyderabad, Indiapayskrishnagannamaraju@gmail.comD.Saroj VernekarDepartment of Mathematics, Stanley College of Engineering and Technology for Women, Hyderabad.Department of Mathematics, Stanley College of Engineering and Technology for Women, Hyderabad.paysrsaroj@stanley.edu.inY. V. K.Ravi KumarBirla Institute of Technology & Science (BITS)-Pilani, Hyderabad, India.Birla Institute of Technology & Science (BITS)-Pilani, Hyderabad, India.paysyvkravi@gmail.comMicropolar fluid Peristalsis Cilia Magnetic field Porous medium. [Akbar, N. S., A. W. Butt, D. Tripathi and A. Bég (2017). Physical hydrodynamic propulsion model study on creeping viscous flow through a ciliated porous tube, Indian Academy of Sciences, 8852 – 61.##
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]Evaluation of Partially Averaged Navier-Stokes Method in Simulating Flow Past a Sphere 22In recent past partially averaged Navier-Stokes equation (PANS) has been proposed as a scale-resolving bridging method for turbulence computations. Despite the geometric simplicity of the involved boundary conditions, the flow past a sphere is ripe with various complex flow phenomena, which make it an excellent test bed to evaluate various computational fluid dynamics modelling methodologies − both in terms of numerical schemes as well as turbulence models. Specifically, in this work we evaluate PANS in conjugation with the standard k-ε model in terms of (i) influence of filter parameters, (ii) sensitivity to free stream viscosity ratio and (iii) choice of numerical schemes at supercritical Reynolds number of 1.14x106. Careful evaluations are made by comparing PANS results against available experimental data as well available detached eddy simulation (DES) and large eddy simulation (LES) results. Our study finds that indeed − as purported by the PANS theory − a reduction in the value of the first filter parameter (fk) successfully captures the complex vortical structures that exist past a sphere, shows far superior performance than unsteady Reynolds-averaged Navier-Stokes (URANS) simulations and somewhat improved performance even over some of the LES studies reported in literature. Our study shows that in terms of most of the quantities of interest, PANS performance is almost at par with that of DES. 13331348S.SarohaApplied Mechanics Department, IIT Delhi, 110016, IndiaApplied Mechanics Department, IIT Delhi, 110016, Indiapayssagarsaroha18@gmail.comS. S.SinhaApplied Mechanics Department, IIT Delhi, 110016, IndiaApplied Mechanics Department, IIT Delhi, 110016, Indiapayssawan@iitd.ac.inS.LakshmipathyGexcon AS, Bergen, 5072, NorwayGexcon AS, Bergen, 5072, Norwaypaysl.sunil@gmail.comComputational Study Scale-resolving methods High Reynolds number Flow past a sphere. [Achenbach, E. (1972). Experiments on the flow past spheres at very high reynolds numbers. Journal of Fluid Mechanics 54(3), 565–575.##
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]Application of Electric Field to Developing Falling Films using Wire-Plate Electrode Configuration- An Experimental Study22Experimental investigation of Electrohydrodynamic developing falling film flow of transformer oil has been conducted within an inclined rectangular channel and hydrodynamic characteristics of the flow have been revealed. The electric field has been generated by five overhead thin wire electrodes connected to the positive high DC voltage on the air and the grounded plate electrodes which are placed upon the floor of the channel. It is the first time that the wavy behavior on a liquid falling film's interface has been created by this electrode configuration. A non-intrusive method has been used to measure the local flow structure by a high-speed camera, then statistical characteristics of the wavy falling film have been computed by image processing of the captured video frames. By applying 13-16 kV to the wire electrodes, the influence of EHD force on the wavy behavior of falling film has been conducted for Reynolds number 10-120 in the laminar-wavy regime at three different inclination angles 15◦, 30◦ and 45°. The vertical distance of the high-voltage wire electrodes to ground electrodes has been set to 14 mm. The liquid velocity, film thickness, and wave frequency have been measured for non-electrified and electrified falling film, and their results have been evaluated with other experimental studies and an acceptable agreement has been obtained. The results indicate that the proposed HV wire-grounded plate electrode configuration in this study does not disturb the original structure of the falling film and by intensifying the wavy behavior of laminar falling film can either suppress or enhance heat/mass transfer rate. The effects of the applied voltage on the frequency, velocity and film thickness of the falling liquid film have been also discussed in detail.13491363R.RouhollahiFaculty of Mechanical Engineering, Department of Mechanical Engineering, University of Tabriz, Tabriz, IranFaculty of Mechanical Engineering, Department of Mechanical Engineering, University of Tabriz, Tabriz, Iranpayssima_baheri@yahoo.comS.Baheri IslamiFaculty of Mechanical Engineering, Department of Mechanical Engineering, University of Tabriz, Tabriz, IranFaculty of Mechanical Engineering, Department of Mechanical Engineering, University of Tabriz, Tabriz, Iranpaysbaheri@tabrizu.ac.irR.GharraeiMechanical Engineering Department, Azarbaijan Shahid Madani University, Tabriz, IranMechanical Engineering Department, Azarbaijan Shahid Madani University, Tabriz, Iranpaysgharraei@azaruniv.ac.irM. R.Heirani NobariDepartment of Mechanical Engineering, Amirkabir University of Technology, Tehran, IranDepartment of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iranpaysmrnobari@aut.ac.irEHD Falling film Dielectric Image processing Wire-plate electrode.[Ambrosini, W. et al. (1999). Experimental Investigation on Wave Velocity in a Falling Film. In 2-Nd Int. Symp. Two-Phase Flow Modelling and Experimentation, 23–26.##
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]Particle Image Velocimetry and Finite Volume Method Study of Bi-leaflet Artificial Heart Valve22The key feature of the bi-leaflet valve is the geometry of the two leaflets, which can be crucial in determining the flow field. In this paper, observations were made on the flow pattern of the blood through the use of bi-leaflet type mechanical prosthetic valve (MHV). Finite volume method (FVM) analysis was conducted using fluid-structure interaction (FSI) method that solved on a dynamic mesh. In terms of the validation, particle image velocimetry (PIV) was used to verify the findings obtained from FVM analysis. The results of velocity and vorticity were the main parameters to be compared. Based on the findings, the results computed for the leaflets motion and the flow field using FVM was found to be in agreement with PIV experimental data. The pressure obtained for the simulation is in the range of 10,666 – 16,000 Pa, which is an ideal and healthy blood pressure level of human. The vorticity was observed to be formed behind the valve with DVI value of 1.275 (simulation) and 1.457 (experiment), lower than the expected range for a normal DVI in mitral valve. The maximum shear stress achieved (22.5481 Pa) is in the range of platelets activation, which could lead to thrombus formation. The maximum Von Mises stress was found to be at the hinge region of the bi-leaflet valve. These results will serve as a basis for valve design to improve the hemodynamic properties of the heart valve. 13651375H.Abu BakarSchool of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, MalaysiaSchool of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysiapayshaziqbakar@gmail.comA.AbasSchool of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, MalaysiaSchool of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysiapaysaizatabas@usm.myN.Hafizah MokhtarSchool of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, MalaysiaSchool of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysiapaysnhafizahmokhtar@gmail.comN.RazakSchool of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, MalaysiaSchool of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysiapaysnorizham@usm.myM.Najib Bin Abdul HamidMechanical Sect. Universiti Kuala Lumpur Malaysia Spanish Institute, Kulim Hi-Tech Park, 09000 Kulim, KedahMechanical Sect. Universiti Kuala Lumpur Malaysia Spanish Institute, Kulim Hi-Tech Park, 09000 Kulim, Kedahpaysmnajib@unikl.edu.myMechanical heart valve Particle image velocimetry Fluid-structure interaction Dynamic mesh. [Al-Atabi, M., & Lim, Y. (2013). Investigation of Blood Flow through the Mitral Valve (Vol. 9).##
Annerel, S., Claessens, T., Degroote, J., Segers, P., & Vierendeels, J. (2014). Validation of a numerical FSI simulation of an aortic BMHV by in vitro PIV experiments. Medical Engineering & Physics, 36(8), 1014-1023. ##
Arefin, M. S. (2017). An investigation on the effects of the angles between the mitral and aortic orifice during diastolic period using FSI. Pathophysiology. ##
Bark, D. L., Yousefi, A., Forleo, M., Vaesken, A., Heim, F., & Dasi, L. P. (2016). Reynolds shear stress for textile prosthetic heart valves in relation to fabric design. Journal of the Mechanical Behavior of Biomedical Materials, 60, 280-287.##
Chatpun, A. K.-i. S. (2013). Mechanical analysis of mechanical aortic heart valve: Trileaflet versus bileaflet. The 6th 2013 Biomedical Engineering International Conference, 1-4. ##
Dangas, G. D., Weitz, J. I., Giustino, G., Makkar, R., & Mehran, R. (2016). Prosthetic Heart Valve Thrombosis. Journal of the American College of Cardiology, 68(24), 2670-2689. ##
Del Gaudio, C., Gasbarroni, P. L., & Romano, G. P. (2016). Experimental investigations on the fluid-mechanics of an electrospun heart valve by means of particle image velocimetry. Journal of the Mechanical Behavior of Biomedical Materials, 64, 229-239.##
Ducci, A., Pirisi, F., Tzamtzis, S., & Burriesci, G. (2016). Transcatheter aortic valves produce unphysiological flows which may contribute to thromboembolic events: An in-vitro study. Journal of biomechanics, 49(16), 4080-4089. ##
Harris, C., Croce, B., & Cao, C. (2015). Tissue and mechanical heart valves. Annals of Cardiothoracic Surgery, 4(4), 399-399.##
Hedayat, M., Asgharzadeh, H., & Borazjani, I. (2017). Platelet activation of mechanical versus bioprosthetic heart valves during systole. Journal of biomechanics, 56, 111-116.##
Hong, T., & Kim, C. N. (2011). A numerical analysis of the blood flow around the Bileaflet Mechanical Heart Valves with different rotational implantation angles. Journal of Hydrodynamics, Ser. B, 23(5), 607-614. ##
Kadhim, S., Nasif, M., Al-Kayiem, H., & Al-Waked, R. (2016). Using fluid structure interaction technique to investigate the effect of vibration on bileaflet mechanical heart valve deformation (Vol. 11).##
Kaminsky, R., Kallweit, S., Rossi, M., Morbiducci, U., Scalise, L., Verdonck, P., & Tomasini, E. P. (2008). PIV Measurements of Flows in Artificial Heart Valves Particle Image Velocimetry: New Developments and Recent Applications (pp. 55-72). Berlin, Heidelberg: Springer Berlin Heidelberg.##
Le, T. B., & Sotiropoulos, F. (2013). Fluid–structure interaction of an aortic heart valve prosthesis driven by an animated anatomic left ventricle. Journal of Computational Physics, 244, 41-62.##
Luraghi, G., Wu, W., De Gaetano, F., Rodriguez Matas, J. F., Moggridge, G. D., Serrani, M., . . . Migliavacca, F. (2017). Evaluation of an aortic valve prosthesis: Fluid-structure interaction or structural simulation? Journal of biomechanics, 58, 45-51.##
Misawa, Y. (2015). Valve-related complications after mechanical heart valve implantation. Surgery Today, 45(10), 1205-1209. ##
Mokhtar, N. H., Abas, A., Teong, S. L., & Razak, N. A. (2016). Particle image velocimetry experiment of blood flow through stent in artery bifurcation aneurysm problem. AIP Conference Proceedings, 1775(1), 030095.##
Nguyen, V.-T., Kuan, Y. H., Chen, P.-Y., Ge, L., Sotiropoulos, F., Yoganathan, A. P., & Leo, H. L. (2012). Experimentally Validated Hemodynamics Simulations of Mechanical Heart Valves in Three Dimensions. Cardiovascular Engineering and Technology, 3(1), 88-100. ##
Samar Abbas, S., Nasif, M., Meor Said, M. A., Al-Waked, R., & Kadhim, S. (2017). Numerical investigation on effect of leaflet thickness on structural stresses developed in a bileaflet mechanical heart valve for its sustainable manufacturing (Vol. 131).##
Sato, M., Harasaki, H., Wika, K. E., Soloviev, M. V., & Lee, A. S. (2003). Blood Compatibility of a Newly Developed Trileaflet Mechanical Heart Valve. ASAIO Journal, 49(1), 117-122. ##
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Su, B., Zhong, L., Cui, F., Gideon Praveen, K., Hui Qun, P., Kim Fatt Jimmy, H., & Leo, H. (2013). FSI Modeling of Prosthetic Mitral Valve Dynamics and Left Ventricular Flow during Diastole.##
Su, B., Zhong, L., Wang, X.-K., Zhang, J.-M., Tan, R. S., Allen, J. C., . . . Leo, H. L. (2014). Numerical simulation of patient-specific left ventricular model with both mitral and aortic valves by FSI approach. Computer Methods and Programs in Biomedicine, 113(2), 474-482. ##
Zhou, F., Cui, Y. Y., Wu, L. L., Yang, J., Liu, L., Maitz, M. F., . . . Huang, N. (2016). Analysis of Flow Field in Mechanical Aortic Bileaflet Heart Valves Using Finite Volume Method. Journal of Medical and Biological Engineering, 36(1), 110-120.##
]Experimental and Theoretical Study on Spray Angles of Bi-Swirl Coaxial Injectors 22An experimental and theoretical study was undertaken to investigate the effects of the recess length, swirl direction, and mixture ratio on the spray angles of the bi-swirl coaxial injectors with the inner, closed-type and outer, open-type swirl injectors. Eight bi-swirl coaxial injectors with a range of recess lengths and different swirl directions between the inner and outer swirl injectors were used. As the recess length was increased, each bi-swirl coaxial injector exhibited external-mixing, tip-mixing, or internal-mixing spray characteristics. To measure the spray angles, cold-flow tests for which the mass flow rates of the two injectors were varied were performed to capture the spray images. The single-injection results indicated that the spray cone angles of both the inner and outer swirl injectors were relatively unaffected by the mass flow rate and the swirl direction, with the recess length influencing the spray cone angles of the inner swirl injectors. The bi-injection tests show that the spray angles are significantly dependent on the recess length and the mixture ratio, while also being affected by the swirl direction, especially regarding the internal-mixing bi-swirl coaxial injectors. Theoretical models that can predict the spray angles were developed and compared using the experimental data. The theoretical models could approximate the combined spray angles of the internal-mixing bi-swirl coaxial injectors. 13771386W.YoonSchool of Mechanical Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, KoreaSchool of Mechanical Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Koreapaysdnjswo122@gmail.comK.AhnSchool of Mechanical Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, KoreaSchool of Mechanical Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Koreapayskbahn@cbnu.ac.krBi-swirl coaxial injector Spray angle Recess length Swirl direction Mixture ratio. [Abramovich, G. N. (1944). The theory of swirl atomizers. In Industrial Aerodynamics, Moscow, 114-121.##
Ahn, K., Y. M. Han, S. Seo, and H. S. Choi (2011). Effects of injector recess and chamber pressure on combustion characteristics of liquid-liquid swirl coaxial injectors. Combustion Science and Technology 183(3), 252-270.##
Ahn, K., Y. M. Han, and H. S. Choi (2012). Effects of recess length on discharge coefficients of swirl coaxial injectors. Combustion Science and Technology 184(3), 323-336.##
Ahn, K., J. G. Kim, and H. S. Choi (2014). Effects of injector recess on heat flux in a combustion chamber with cooling channels. Aerospace Science and Technology 37, 110-116.##
Ahn, K. and H. S. Choi (2017a). A study on discharge coefficients of closed-type swirl injectors for a liquid rocket engine. Atomization and Sprays 27(7), 569-578.##
Ahn, K. and H. S. Choi (2017b). An extensive study on the discharge coefficients of open-type swirl injectors, Atomization and Sprays 27(10), 835-846.
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]Determination of Pressure Drop Characteristics of Fly Ash Suspension with Additive for Hydraulic Transportation 22Present study was conducted with objective of investigating the fly ash slurry transportation at higher solid concentration. The rheological behaviour of fine-particulate fly ash slurry suspension was studied with the additive. Pressure drop was measured in 50 mm diameter pipe with fly ash slurry at solid concentration (Cw) of 30, 40, 50 and 60% (by weight). Measurements were made for flow velocities in the range of 1 to 3 ms-1. Sodium sulfate was used as an additive in range of 0.2-0.6% (by weight). Addition of sodium sulfate in fly ash slurry suspension tends to improve the pressure drop characteristics. Reduction rate in pressure drop was pronounced more with 0.4% sodium sulfate in fly ash slurry and marginal with 0.2 and 0.6%. Therefore, results revealed that fly ash-water slurry can be transported at high concentration thorough pipelines with lower power consumption. 13871393S.KumarNational Institute of technology, Jamshedpur, IndiaNational Institute of technology, Jamshedpur, Indiapayssatish.kumar@thapar.eduFly ash Rheology Relative viscosity Pressure drop Energy consumption. [Chandel, S., S. N. Singh, and V. Seshadri (2009). Deposition characteristics of coal ash slurries at higher concentrations. Advanced Powder Technology, 20(4), 383-389.##
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Kumar, S., S. K. Mohapatra, and B. K. Gandhi (2013). Effect of addition of fly ash and drag reducing on the rheological properties of bottom ash. International Journal of Mechanical Material Engineering, 8, 1-8.##
Kumar, S., B. K. Gandhi, and S. K. Mohapatra (2014). Performance characteristics of centrifugal slurry pump with multi-sized particulate bottom and fly ash mixtures. Particulate Science and Technology, 32(5), 466-476.##
Kumar, K., S. Kumar, M. Gupta and H. C. Garg (2017) Measurement of flow characteristics for multiparticulate bottom ash-water suspension with additives. Journal of Residual Science and Technology 14(1), 11-17.##
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]Improvement of Compressible Vorticity Confinement Method by Combining It with Vortex Feature Detection Methods22In the present study, the performance of the vorticity confinement method has been improved by combining it with the vortex feature detection methods. In the conventional vorticity confinement method, the only parameter to apply or not to apply vorticity confinement is the non-zero value of vorticity. On the other hand, the presence of vorticity in some cases, like the boundary layer and the shear layer flows, does not imply the presence of vortices. Applying the vorticity confinement at these points can lead to errors, in addition to loss of solution time. In order to solve this problem, using the combination of vorticity confinement method and four methods of vortex feature detection (nondimensional Q, nondimensional λ_2, nondimensional modified ∆, and the S-Ω correlation) the vorticity confinement term is applied only in vortex regions. In order to investigate the effects of this combination, the compressible Euler equation has been investigated for the problem of two-dimensional stationary single vortex at Mach number 0.5. The results indicate significant positive effects in reducing the solving time, decreasing the sensitivity of the solution to the amount of confinement parameter and significant elimination of the oscillation.13951406M.MohseniDepartment of Mechanic Engineering, University of Birjand, Birjand, South Khorasan, Iran.Department of Mechanic Engineering, University of Birjand, Birjand, South Khorasan, Iran.paysmostafa65.mohseni@gmail.comM.Malek JafarianDepartment of Mechanic Engineering, University of Birjand, Birjand, South Khorasan, Iran.Department of Mechanic Engineering, University of Birjand, Birjand, South Khorasan, Iran.paysmmjafarian@birjand.ac.irThreshold function Confinement parameter Vortex Oscillations. [Bagheri-Esfeh, H. and Malek-Jafarian, M. (2011). Development of artificial dissipation schemes and compressible vorticity confinement methods. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 225(8), 929-945.##
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]One-Dimensional Mathematical Model for Solar Drying of Beds of Sludge 22A one-dimensional mathematical model for the description of solar drying of beds of sewage sludge is developed and implemented with the software Engineering-Equation-Solver. After the discussion of relevant literature, the assumptions and general conditions of the model are explained. Governing differential equations for heat and mass transport inside the sludge are derived, followed by a discussion about correlations used for the determination of surface transport phenomena and for the description of thermophysical properties. Numerical discretization is achieved locally through the Finite Difference Method and temporary through the Runge-Kutta-Method. Finally, a parametric analysis on the sludge drying process is carried out. The obtained results demonstrate the effect of ambient parameters such as solar radiation, airflow rate, gas temperature, geometric aspects etc. on the drying process. The developed model may be used for further prediction and estimation of drying characteristics under several conditions. 14071419A. M. O.SiqueiraUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, BrazilUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazilpaysantonio.siqueira1000@gmail.comN.KrinkTechnische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, GermanyTechnische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germanypaysniclas.krink@gmail.comF. P. S.PereiraUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, BrazilUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazilpaysfeliciano.pereira@ufv.brF. G.VillelaUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, BrazilUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazilpaysfgvillela@msn.comG. S.SilvaUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, BrazilUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazilpaysgabrielsiqueira25@outlook.comA. F.MouraUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, BrazilUniversidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazilpaysana.f.moura@ufv.brHeat and mass transfer Dryer performance Mathematical model Simulation Porous material. [Agrawal, S. G. and R. N. Methekar (2017). Mathematical model for heat and mass transfer during convective drying of pumpkin. Food and Bioproducts Processing 101, 68-73.##
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]Comparative Study of Reversal Flow during the Evaporation or Condensation of Water and Ethanol Film in a Vertical Channel22A comparative study of reversal flow is carried out to investigate the effect of thermal and mass buoyancy forces with evaporation or condensation along a vertical channel. The highlight is focused on the effects of phase change of two different liquid films having widely different properties, on heat and mass transfer rates in the channel. The evaporation occurs along isothermal and wetted walls. The induced laminar upward flow consists of a mixture of blowing air and vapour of water or ethanol. Various combinations of thermal and solutal boundary conditions (cooling and heating modes) are considered to investigate extensively their influence on the flow development. A two-dimensional steady state and elliptical flow model is used and the liquid film is assumed extremely thin. The governing equations of the model are solved by FVM and the velocity-pressure fields are treated with the SIMPLER algorithm. The results show that the buoyancy forces have a significant effect on the hydrodynamic, thermal and mass fields of both gas mixtures. In addition, the flow reversal is predicted with a relatively high temperature difference between the air-mixture and the wetted walls. 14211426K.SellamiTransfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. 32 El Alia, 16111 Bab Ezzouar, Algiers AlgeriaTransfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. 32 El Alia, 16111 Bab Ezzouar, Algiers Algeriapayssellami_karima@yahoo.frN.LabsiTransfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. 32 El Alia, 16111 Bab Ezzouar, Algiers AlgeriaTransfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. 32 El Alia, 16111 Bab Ezzouar, Algiers Algeriapaysnabilalabsi@yahoo.frM.FeddaouiGEMS Laboratry, Ibn Zohr University, ENSA B.P. 1136, Agadir, MoroccoGEMS Laboratry, Ibn Zohr University, ENSA B.P. 1136, Agadir, Moroccopaysm.feddaoui@uiz.ac.maM.OubellaLaboratory of Energy, Materials and Systems Engineering, National School of Applied Sciences of Agadir, University of Ibn Zohr, MoroccoLaboratory of Energy, Materials and Systems Engineering, National School of Applied Sciences of Agadir, University of Ibn Zohr, Moroccopaysm.oubella@uiz.ac.maY. K.BenkahlaTransfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. 32 El Alia, 16111 Bab Ezzouar, Algiers AlgeriaTransfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. 32 El Alia, 16111 Bab Ezzouar, Algiers Algeriapaysyoubenkahla@yahoo.frM.NajimLaboratory of Energy, Materials and Systems Engineering, National School of Applied Sciences of Agadir, University of Ibn Zohr, MoroccoLaboratory of Energy, Materials and Systems Engineering, National School of Applied Sciences of Agadir, University of Ibn Zohr, Moroccopaysmoncif7@gmail.comEvaporation Condensation Cooling mode Heating mode Vertical channel Buoyancy forces Reversal flow Elliptical flow model. [Ait, H., Benhamou Z., Galanis B. (2004). Laminar mixed convection of humid air in a vertical channel with evaporation or condensation at the wall. Int J thermal sciences 43(6), 531-539.##
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]Two Semi-Analytical Methods Applied to Hydrodynamic Stability of Dean Flow 22Hydrodynamic stability of Dean flow is studied using two semi-analytical methods of differential transform method (DTM) and Homotopy perturbation method (HPM). These two methods are evaluated to examine the effectiveness and accuracy of the solution of considered eigenvalue problem. Very good accordance is achieved between our semi-analytical results compared to existing numerical data. Based on our analysis, in the similar number of truncated terms, HPM is more accurate in comparison with DTM. We also concluded that for the higher wave numbers, HPM provide more accurate results with less truncated terms compared to the DTM. Finally, we found the critical Dean number 35.927 corresponding to wave number of 3.952 for onset of instability of Dean flow. 14271435H.NowruziDepartment of Maritime Engineering, Amirkabir University of Technology, Tehran, Tehran, IranDepartment of Maritime Engineering, Amirkabir University of Technology, Tehran, Tehran, Iranpaysh.nowruzi@aut.ac.irS.Salman NourazarDepartment of Mechanical Engineering, Amirkabir University of Technology, Tehran, IranDepartment of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iranpaysicp@aut.ac.irH.GhassemiDepartment of Maritime Engineering, Amirkabir University of Technology, Tehran, Tehran, IranDepartment of Maritime Engineering, Amirkabir University of Technology, Tehran, Tehran, Iranpaysgasemi@aut.ac.irHydrodynamic stability Dean flow Differential transform method Homotopy perturbation method. [Aider, A. A., Skali, S. and J. P. Brancher (2005). Laminar-turbulent transition in Taylor-Dean flow. In Journal of Physics: Conference Series 14, 118.##
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]Design of a Mini Double-Discharge Centrifugal Pump under Multiphase Flow by CFD and Experimental Verification 22Pumps are irreplaceable products in various systems and processes. Pumps can be manufactured in various size in industry. The mini pumps are commonly used in some household electrical appliances, automobile etc. Some pumping applications is required two outlet ports. The use of two pumps in such a case brings high costs. Instead, pumping on two different lines with a single pump provides both a more compact design and lower cost, if the system is available. In this study, it is aimed to design a single-suction and double-outlet pump by using a single electric motor. For this purpose, a conceptual design for the pump has been proposed and design parameters which have an effect on the pump performance have been determined. Pump performance have been calculated by using the ANSYS Fluent, Computational Fluid Dynamics (CFD) code considering to multiphase flow, and optimization studies have been performed with the determined parameters. The pumps have been obtained by the optimization works have been manufactured and tested to investigate whether the pumps provide the expected operating conditions and performances. Finally, the CFD results have been verified by the tests and the pump provided the expected operating conditions and performances. 14371448Z.ParlakDepartment of Mechanical Engineering, Sakarya University, Serdivan, Sakarya, 54187, TurkeyDepartment of Mechanical Engineering, Sakarya University, Serdivan, Sakarya, 54187, Turkeypayszparlak@sakarya.edu.trM.KemerliDepartment of Mechanical Engineering, Sakarya University, Serdivan, Sakarya, 54187, TurkeyDepartment of Mechanical Engineering, Sakarya University, Serdivan, Sakarya, 54187, Turkeypaysmkemerli@sakarya.edu.trT.EnginDepartment of Mechanical Engineering, Sakarya University, Serdivan, Sakarya, 54187, TurkeyDepartment of Mechanical Engineering, Sakarya University, Serdivan, Sakarya, 54187, Turkeypaysengint@sakarya.edu.trY.KoçArçelik A.Ş. Tuzla, İstanbul, 34950, TurkeyArçelik A.Ş. Tuzla, İstanbul, 34950, Turkeypaysyusufkoc@arcelik.comPump design Centrifugal pump Double-outlet pump CFD Multiphase flow. [Asuaje, M., Bakir, F., Kouidri, S., Kenyery, F., & Rey, R. (2005). Numerical modelization of the flow in centrifugal pump: volute influence in velocity and pressure fields. International journal of rotating machinery 2005(3), 244-255.##
Barrio, R., Parrondo, J., & Blanco, E. (2010). Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points. Computers & Fluids 39(5), 859-870.##
Bayeul-Lainé, A. C., Simonet, S., Bois, G., & Issa, A. (2012). Two-phase numerical study of the flow field formed in water pump sump: influence of air entrainment. In IOP Conference Series: Earth and Environmental Science (Vol. 15, No. 2, p. 022007). IOP Publishing.##
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Chalghoum, I., Elaoud, S., Akrout, M., & Taieb, E. H. (2016). Transient behavior of a centrifugal pump during starting period. Applied Acoustics 109, 82-89.##
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