20171050266Evaluation of Optimum Modes and Conditions of Cavitation and Acoustic Absorption Intensification for Increasing Efficiency of Gas Mixtures Separation22The paper presents theoretical studies of absorption gas mixture separation under ultrasonic vibrations influence, which provides cavitation and acoustic process intensification. The theoretical studies based on consecutive consideration of this process beginning with single cavitation bubble dynamic which generates shockwave for increasing interface “gas-liquid” and ending with determining absorption productivity providing required concentration of target gas mixture component. In result of the studies, it is evaluated, that cavitation and acoustic intensification increase interface “gas-liquid” up to 3 times with amplitude of oscillations of solid surface 1…2 μm. From the data about surface increasing the analysis of the gas absorption process in the liquid film was performed. For this analysis, the model of gas absorption taking into account surface increasing under acoustic cavitation influence was developed. The model of absorption allows to obtain that the absorption productivity under ultrasonic vibrations influence is increased up to 2 times and more. The obtained results can be used for development of high-efficiency absorption apparatus that is supplemented by ultrasonic influence sources.12351246R. N.GolykhBiysk Technological Institute (branch) of Altai State Technical University named after I.I. PolzunoBiysk Technological Institute (branch) of Altai State Technical University named after I.I. PolzunoRussia (Россия)romangl90@gmail.comAbsorption Cavitation Gas mixture Ultrasonic Interphase surface.[Amin, R., A. Islam, R. Islam and S. Islam (2014). Simulation of N2 Gas Separation Process from Air, IOSR Journal of Applied Chemistry 6(5), 9-13.##
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]Curvature Effects on the Electromagnetic Force, Efficiency, and Heat Transfer of a Weak Low Profile Magneto-Hydrodynamic Blanket Propulsion System22The present study concerns the numerical assessment of the effects of longitudinal and lateral curvature of a flexible low profile magneto-hydrodynamic blanket on its thrust, performance, and heat transfer. To this end, after validating the solver with the analytical solution of the Hartman problem, negative and positive curvatures are taken into consideration in lateral and longitudinal directions on the blanket and electromagnetic and velocity fields, temperature distributions, force density fields and profiles are extracted and compared to the flat MHD blanket. It is demonstrated that negative curvatures increase the thrust force and temperature of the blanket and the reverse occurs for the positive curvatures. It is also shown that the longitudinal curvature affects the blanket thrust by -2.5% up to 5.2%, its efficiency by nearly 6% and the temperature change from -25 up to 28%. On the other hand, for the lateral curvatures, the overall thrust produced by the blanket is affected by about -6% to +6%, the efficiency is affected by -10% to 25% and temperature change is affected by -2 to 6%.12611270M. A.Feizi ChekabDepartment of Marine Technology, Amirkabir University of Technology, Tehran, IranDepartment of Marine Technology, Amirkabir University of Technology, Tehran, Iranpaysfayzi@aut.ac.irP.GhadimiDepartment of Marine Technology, Amirkabir University of Technology, Tehran, IranDepartment of Marine Technology, Amirkabir University of Technology, Tehran, IranIran(ایران)parviz.ghadimi@gmail.comMagneto-hydrodynamics (MHD) MHD propulsive blanket Heat transfer Curvature effects Blanket thrust Efficiency.[Abdollahzadeh, M. Y. (2014). Analytical study of magnetohydrodynamic propulsion stability. Journal of Marine Science and Application 13, 281-290.##
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]Investigations of Combustion Performance in LPP Combustor22A Lean Premixed Prevaporized (LPP) low-emission combustor which is applied with the combustion technology of staged lean fuel is developed. To study the cold flow dynamics and the combustion performance of the LPP combustor, both experimental tests using the Particle Image Velocimetry (PIV) to quantify the flow dynamics and numerical simulation using the Fluent software are conducted respectively. To investigate the emissions of the LPP combustor, four kinds of inlet conditions (viz. 7%, 30%, 85% and 100% F∞ (Thrust Force)) were conducted using numerical simulation. Numerical results are in good agreement with the experimental data. Results show that:1) a Primary recirculation zone (PRZ), a Corner recirculation zone (CRZ) and a Lip recirculation zone (LRZ) exist in the LPP combustor, and the velocity gradients between pilot swirling flow and primary swirling flow have contributed to the exchanges of mass, momentum and energy. 2) With the decrease of thrust force, NO mass fraction, CO2 mass fraction and total pressure losses at the exit of LPP combustor fall gradually. 3) Thermal NO formation rate closely relate to the zone area where gas temperature overruns 1900K and the maximum temperature in LPP combustor. 4) The combustion performance of the LPP combustor proposed in this paper is very well, and through comparative analysis with four kins of typical gas tubine combustor, the NO emission is very low and is equivalent to the CAEP6 43.87%.12711282Y.YanJiangsu Province Key Laboratory of Aerospace Power Systems, Nanjing University of Aeronautics and AstronauticsJiangsu Province Key Laboratory of Aerospace Power Systems, Nanjing University of Aeronautics and AstronauticsChina (中国)yanyw@nuaa.edu.cnY.LiuJiangsu Province Key Laboratory of Aerospace Power Systems, Nanjing University of Aeronautics and AstronauticsJiangsu Province Key Laboratory of Aerospace Power Systems, Nanjing University of Aeronautics and Astronauticspaysnuaaliu@126.comJ.LiJiangsu Province Key Laboratory of Aerospace Power Systems, Nanjing University of Aeronautics and AstronauticsJiangsu Province Key Laboratory of Aerospace Power Systems, Nanjing University of Aeronautics and Astronauticspayslijinghua@nuaa.edu.cnW.CaiSchool of mechanical engineering, Nanjing University of Science and TechnologySchool of mechanical engineering, Nanjing University of Science and Technologypayscai@jafmonline.netLean premixed prevaporized (LPP) Low-emission combustor Cold flow dynamics Particle image velocimetry (PIV) Combustion performance NO.[Endo, Y., Y. Yarita, T. Ide, N. Hiromitu, H. Kawashima and T. Ishima (2012). Evaluation of flow structure in gas turbine combustor models by PIV, 16th Int Symp on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal 09-12.##
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]Particle and Gas Flow Modeling of Wall-impinging Diesel Spray under Ultra-high Fuel Injection Pressures22Advanced models of spray breakup and droplet collision are implemented in OpenFOAM code for comparing the flat-wall impinging and free fuel sprays under ultra-high pressure direct injection diesel engines. The non-evaporating spray and ambient gas flow characteristics are analyzed by a combination of Eulerian and Lagrangian methods for continuous and dispersed phase, respectively. Various injection pressures and two different impinging distances are used. Reynolds Averaged Navier Stokes (RANS) equations are solved using standard k-ε turbulence model. Computational domain and grid size are determined based on a mesh study. Numerical results are validated by published experimental data for free and wall-impinging sprays. The robustness and accuracy of the proposed scheme are confirmed by comparing the main characteristics of spray and surrounding gas against published experimental data. To accomplish this, spray shape, penetration and gas velocity vectors are compared with experimental data and insightful understanding of the spray characteristics are provided. In comparison with free spray, tip penetration has been limited in impinging sprays. Turbulent flow in impinging sprays leads to more induced air motion. Also, impinging spray leads to more pushed-out gas velocity. The obtained results indicate that the numerical findings are generally in good agreement with experimental data in case of ultra-high injection pressures and micro-hole injectors.12831291P.GhadimiDepartment of Marine Technology, Amirkabir University of Technology, Tehran, IranDepartment of Marine Technology, Amirkabir University of Technology, Tehran, IranIran(ایران)parviz.ghadimi@gmail.comM.YousefifardAmirkabir University of TechnologyAmirkabir University of Technologypaysyousefifard@aut.ac.irH.NowruziDepartment of Maritime Engineering, Amirkabir University of Technology, Tehran, Tehran, IranDepartment of Maritime Engineering, Amirkabir University of Technology, Tehran, Tehran, Iranpaysh.nowruzi@aut.ac.irWall-impinging spray Free diesel spray Ultra-high injection pressure OpenFOAM.[Ashgriz, N., W. Brocklehurst and D. Talley (2001). Mixing mechanisms in a pair of impinging jets. J. Propul. Power 17(3), 736-749.##
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]Instability of MHD Flow in the Duct with Electrically Perfectly Conducting Walls22The stability problem of conducting fluid flow in a square duct with perfectly conducting walls is investigated. A homogeneous and constant static magnetic field is applied along the vertical direction of the flow. Nonmodal linear stability analysis is performed on this problem for the first time and the effect of the imposed magnetic field is also taken into account. The amplification and distribution of primary optimal perturbations are obtained by solving iteratively the direct and adjoint governing equations with respect of perturbations. Four modes of perturbations with different symmetries in the space are investigated. Computational results show that, the MHD duct flow is stable at either small or large Hartmann number, but unstable at moderate one. The primary optimal perturbations are in the form of streamwise vortices, which are located inside the thin sidewall layers parallel to the magnetic field. The size of the vortices is decreased with the growing of Hartmann number Ha, meanwhile the amplification of the perturbations is reduced due to the magnetic damping effect. The Hartmann layer perpendicular to the magnetic field seems to be irrelevant to the stability of the MHD duct flow. The most unstable perturbation is in the form of Mode I, which having co-rotating vortices at opposite sidewalls and the vortices tend to enhance each other. 12931304S.DongDepartment of Power Engineering, North China Electric Power University, Baoding 071003, ChinaDepartment of Power Engineering, North China Electric Power University, Baoding 071003, ChinaChina (中国)shuai.dong@ncepu.edu.cnL. S.LiuDepartment of Power Engineering, Baoding, Hebei ProvinceDepartment of Power Engineering, Baoding, Hebei Provincepays1121509952@qq.comX. M.YeDepartment of Power Engineering, Baoding, Hebei ProvinceDepartment of Power Engineering, Baoding, Hebei Provincepaysyexuemin@163.comNonmodal stability analysis Optimal perturbation Hartmann layer Sidewall layer Conducting walls.[Biau, D., H. Soueid and A. Bottaro (2008). Transition to turbulence in duct flow. J. Fluid Mech. 596, 133-142.##
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]Synthetic Separation Control Using Vortex Generator and Slot Jet in a High Load Compressor Cascade22The compressor cascade performance is significantly restricted by the secondary flow mainly presented as the trailing edge separation and corner stall. This paper develops a synthetic flow control approach in a high turning cascade using the vortex generator and slot jet approach. Numerical simulations were conducted to assess the flow control benefits and illustrate the flow control mechanisms. Four configurations, the baseline, the two indi-vidual approaches and the synthetic approach, were simulated to compare the separation control effects. The simulations show that all the three configurations achieve considerable improvements of the cascade perfor-mance and the cascade sensitivity to incidence angle is greatly decreased. The synthetic approach improves the most among them which is almost the superposition of the two individual ones. In the synthetic approach, the trailing vortex induced by the vortex generator suppresses the end wall cross flow and deflects the passage vor-tex, and then prevents the production of corner stall; at the same time, the slot jet speeds up the trailing edge separation caused by the cascade high camber. Owing to the combination of the two aspects, the synthetic ap-proach restricts the developments of secondary flow and vortices in the cascade, and improves the outflow uni-formity. The synthetic approach nicely utilizes the advantages of the two individual approach while avoids the shortages by the complementation, so it can achieve more powerful flow control effects. At the end, vortices models are established to illustrate the secondary flow structure and the flow control mechanisms.13051318J.HuSchool of Aeronautics and Astronautics Engineering, Air Force Engineering UniversitySchool of Aeronautics and Astronautics Engineering, Air Force Engineering UniversityChina (中国)mr_hu_bluesky@163.comR.Wangrugen@foxmail.comrugen@foxmail.compaysrugen@foxmail.comP.WuSchool of Aeronautics and Astronautics Engineering, Air Force Engineering UniversitySchool of Aeronautics and Astronautics Engineering, Air Force Engineering Universitypayswpg_wangyi@163.comF.LiChongqing University of Science and TechnologyChongqing University of Science and Technologypayslif.cc@qq.comCompressor cascade Flow control High load Vortex generator Slot jet Synthetic separation con-trol[Akcayoz, E., H. D. Vo and A. Mahallati (2015). Controlling Corner Stall Separation with Plasma Actuators in a Compressor Cascade, ASME GT2015-43404.##
Chima, R. V. (2002). Computational Modeling of Vortex Generators for Turbo Machinery, ASME GT2002-30677.##
Gbadebo, S. A., N. A. Cumpsty and T. P. Hynes (2005). Three-dimensional Separations in Axial Compressors, Journal of Turbomachinery, 127(2), 331-339.##
Govardhan, M., A. Rajender and J. P. Umang (2006). Effect of Streamwise Fences on Sec-ondary Flows and Losses in a Two-Dimensional Turbine Rotor Cascade, Journal of Thermal Science 15(4), 296–305##
Guo, S., H. Lu, F. Chen and J. Wu (2013). Vortex Control and Aerodynamic Performance Im-provement of a Highly Loaded Compressor Cascade via Inlet Boundary Layer Suction. Ex-periments in Fluids 54(7), 1570.##
Hecklau, M., O. Wiederhold, V. Zander, R. King, W. Nitsche, M. Swoboda and A. Huppertz (2013). Active Separation Control with Pulsed Jets in a Critically Loaded Compressor Cascade, AIAA Journal 49(8), 1729-1739.##
Hergt, A., R. Meyer and K. Engel (2006). Experi-mental Investigation of Flow Control in Com-pressor Cascades, ASME GT2006-90415.##
Hergt, A., R. Meyer and K. Engel (2013). Effects of Vortex Generator Application on the Perfor-mance of a Compressor Cascade, Journal of Turbomachinary 135(2), 021026.##
Hu, J., R. Wang, R. Li, C. He and Q. Li (2017). Experimental Investigation on Separation Con-trol by Slot Jet in Highly Loaded Compressor Cascade, Proc IMechE Part G: J Aerospace Engineering, Online Publish.##
Hu, J., R. Wang, P. Wu and C. He (2016). Separa-tion Control by Slot Jet in a Critically-Loaded Compressor Cascade, International Journal of Turbo & Jet Engines, Online Publish.##
Kang S. (1993). Investigation of the Three Dimen-sional Flow within a Compressor Cascade with and without Tip Clearance, Ph.D. Thesis, Dept. of Fluid Mechanics, Vrije Universiteit Brussel I-1-V-44.##
Liu, Y., H. Yan and L. Lu (2016). Numerical Study of the Effect of Secondary Vortex on Three-Dimensional Corner Separation in a Compres-sor Cascade, International Journal of Turbo and Jet-Engines 33(1), 9-18.##
Pesteil, A., D. Cellier, O. Domercq, V. Perrot and J. C. Boniface (2010). CREATE: Advanced CFD for HPC Performance Improvement, ASME GT2010-68844.##
Ramzi, M. and G. Abderrahmane (2013). Passive Control via Slotted Blading in a Compressor Cascade at Stall Condition, Journal of Applied Fluid Mechanics 6(4), 571-580.##
Varpe, M. K. and A. M. Pradeep (2015). Benefits of Nonaxisymmetric Endwall Contouring in a Compressor Cascade with a Tip Clearance, Journal of Fluids Engineering 137(5), 051101##
Wu, P., R. Wang, F. Guo, J. Hu and K. Li (2016). Mechanism Analysis of Effects of Vortex Gen-erator on High-Load Compressor Cascade, Journal of Propulsion Technology 37(1), 49-56.##
Wu, P., R. Wang, J. Hu and F. Guo (2014). Influ-ence of the Location of the Slot at the Outlet on the Performance of a Highly-Loaded Diffusion Cascade, Journal of Engineering for Thermal Energy and Power 29(4), 121-126.##
Wu, P., R. Wang, K. Luo and F. Guo (2013). Effect of Slotted Blade on Performance of High-Turning Angle Compressor Cascade, Journal of Aerospace Power 28(11), 2505-2509.##
]Optimization of a Diver Propulsion Vehicle Hydrodynamics Parameter and its’ Shape Improvement by CFD Method for Improving Underwater Speed Record22The hydrodynamic shape of high speed diver propulsion vehicle (DPV) is very important to its performance. One of the basic optimization steps is minimizing DPV drag force to reduce power required. In the present paper, the research has been started by optimization process with a basic design and it would be gradually improved to achieve favorable hydrodynamic characteristics according to diver size and his required volume. The main target is minimizing lift and drag force as objective function. Moreover, this optimization scenario is applicable and it has been followed on the real DPV prototype. The prototype has been constructed and tested in towing tank for results validation. The 3D geometry of a real diver has been created by image processing and software modeling. According to this model the first basic geometry had been designed and then it has been exported to CFD code for steady-state computational analysis. The SST-Kω turbulence model has been selected in the solution to compute hydrodynamic forces. So the position of propulsion system and the shape of vehicle have been improved by repetition process. Output results show that the drag values will be significantly reduced with shape improvement about 51 percent in design speed. 13191328M. R.Sadeghizadeh1Department of Hydro-Aerodynamic Research Center of MUT University1Department of Hydro-Aerodynamic Research Center of MUT UniversityIran(ایران)mr_sadeghizadeh@yahoo.comB.Saranjam1Department of Hydro-Aerodynamic Research Center of MUT University1Department of Hydro-Aerodynamic Research Center of MUT Universitypayssaranjam@mut.ac.irR.Kamali2School of Mechanic Engineering , Shiraz University2School of Mechanic Engineering , Shiraz Universitypayskamali@shirazu.ac.irUnderwater propulsion vehicle CFD optimization Hydrodynamic DPV design[Bixler, B. S. and M.Schloder (1996). Computational fluid dynamics: an analytical tool for the 21st century swimming scientist. Journal of Swimming Research 11, 4–22.##
COHEN, R. C. Z. and et al. (2009). Simulations of Human Swimming Using Smoothed Particle Hydrodynamics, Seventh International Conference on CFD in the Minerals and Process Industries, CSIRO, Melbourne, Australia.##
Frederic, P. et al. (2010). Diver Propulsion Vehicle book, by VDM Publishing, ISBN 6130783159, 9786130783150.##
Griffiths, G. and I. Edwards (2003). Designing and operating next generation vehicles, Elsevier Oceanography Series 69, 229–236.##
Ishak, D. and et al. (2010). Electrically Actuated Thrusters for Autonomous Underwater Vehicle, The 11th IEEE International Workshop on Advanced Motion Control, Nagaoka, Japan.##
ITTC Recommended Procedures and Guidelines (2002). Testing and Extrapolation Methods for Resistance Test, 7.5-02-02-01 and Blockage Corrections 3.6.3, 8.##
ITTC Recommended Procedures and Guidelines (2006). Edited by 22nd ITTC QS Group for Testing and Extrapolation Methods, 7.5-02-01-03 and General Density and Viscosity of Water, Values of Mass Density for Salt Water, page 4 table 2.##
Ramos, R. and et al. (2012). The Effect of Body Positions on Drag During The Streamlined Glide: A Three-Dimensional CFD Analysis, Journal of Biomechanics.##
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]Numerical Simulation with a DES Approach for a High-Speed Train Subjected to the Crosswind22A Detached Eddy Simulation (DES) method based on the SST k-ω turbulence model was used to investigate the instantaneous and time-averaged flow characteristics around the train with a slender body and high Reynolds number subjected to strong crosswinds. The evolution trends of multi-scale coherent vortex structures in the leeward side were studied. These pressure oscillation characteristics of monitoring points on the train surfaces were discussed. Time-averaged pressure and aerodynamic loads on each part of the train were analyzed inhere. Also, the overturning moment coefficients were compared with the experimental data. The results show that the flow fields around the train present significant unsteady characteristics. Lots of vortex structures with different intensities, spatial geometrical scales, accompanied by a time change, appear in the leeward side of the train, in the wake of the tail car and below the bottom of the train. The oscillation characteristics of the flow field around the train directly affect the pressure change on the train surfaces, thereby affecting the aerodynamic loads of the train. The loads of each car fluctuate around some certain mean values, while the positive peak values can be higher than the mean ones by up to 34%. The load contributions of different parts to the total of the train are also obtained. According to it, to improve the crosswind stability of the high-speed train, much more attention should be paid on the aerodynamic shape design of the streamlined head and cross section. In addition, this work shows that the DES approach can give a better prediction of vortex structures in the wake compared with the RANS solution.13291342J.ZhangKey Laboratory of Traffic Safety on Track of Ministry of Education, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, Central South UniversityChina (中国)jie_csu@csu.edu.cnK.HeKey Laboratory of Traffic Safety on Track of Ministry of EducationKey Laboratory of Traffic Safety on Track of Ministry of Educationpays405316005@qq.comX.XiongKey Laboratory of Traffic Safety on Track of Ministry of EducationKey Laboratory of Traffic Safety on Track of Ministry of Educationpaysxhxiong@csu.edu.cnJ.WangKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, ChinaKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, Chinapayswangjiabin@csu.edu.cnG.GaoKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, ChinaKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, Chinapaysgjgao@csu.edu.cnHigh-speed train Load contribution ratio Vortex structure DES Crosswind.[Baker, C. J., J. Jones, F. Lopez-Calleja and J. Munday (2004). Measurements of the cross wind forces on trains. Journal of Wind Engineering and Industrial Aerodynamics 92, 547−563.##
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Cheli, F., F. Ripamonti, D. Rocchi and G. Tomasini (2010a). Aerodynamic behaviour investigation of the new EMUV250 train to cross wind. Journal of Wind Engineering and Industrial Aerodynamics 98(4/5), 189−201.##
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Liu, T. H. and J. Zhang (2013). Effect of landform on the aerodynamic performance of high-speed train in cutting under cross wind. Journal of Central South University 20(3), 830-836.##
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]Hydrodynamic Modelling of Coal-Biomass Mixture in a Bubbling Fluidized Bed Reactor22Biomass is a renewable and sustainable energy source. Co-firing of biomass with coal will increase the renewable energy share by decreasing the coal consumption. In the present paper, hydrodynamic behaviour of coal and biomass mixture is investigated in a fluidized bed reactor. A Computational Fluid Dynamic (CFD) model is developed and the hydrodynamic behaviour of gas and solid is investigated in detail. The CFD model is based on Eulerian-Eulerian multiphase modelling approach where the solid phase properties are obtained by applying the Kinetic Theory of Granular Flow (KTGF). Six different weight percentages of coal and biomass (100:0, 95:5, 90:10, 80:20, 70:30 and 50:50) are used for the present study. The hydrodynamic behaviour is analyzed in terms of the important hydrodynamic parameters like bed pressure drop, bed expansion ratio, particle volume fraction distribution and velocity distribution. The numerical model is also validated by comparing some of the numerical results with our own experimental data generated in a laboratory scale bubbling fluidized bed reactor. 13551362M.Verma1Energy Research and Technology, CSIR-Central Mechanical Engineering Research Institute1Energy Research and Technology, CSIR-Central Mechanical Engineering Research Institutepaysmunna.nitp@gmail.comC.Loha1Energy Research and Technology, CSIR-Central Mechanical Engineering Research Institute1Energy Research and Technology, CSIR-Central Mechanical Engineering Research InstituteINDIAchanchal.loha@gmail.comA. N.Sinha2Department of Mechanical Engineering, National Institute of Technology Patna2Department of Mechanical Engineering, National Institute of Technology Patnapaysansinha@nitp.ac.inM.KumarDepartment of Mechanical Engineering, Indian Institute of Technology GuwahatiDepartment of Mechanical Engineering, Indian Institute of Technology Guwahatipayskmadhurendra56@gmail.comA.SaikiaDepartment of Mechanical Engineering, Indian Institute of Technology GuwahatiDepartment of Mechanical Engineering, Indian Institute of Technology Guwahatipaysanubrata.sba@gmail.comP.Chatterjee1Energy Research and Technology, CSIR-Central Mechanical Engineering Research Institute1Energy Research and Technology, CSIR-Central Mechanical Engineering Research Institutepayspradipcmeri@gmail.comHydrodynamics Fluidized bed Biomass Coal CFD modelling.[Armstrong, L. M., K. H. Luo and S. Gu (2010). Two-dimensional and three-dimensional computational studies of hydrodynamics in the transition from bubbling to circulating fluidised bed. Chemical Engineering Journal 160, 239–248.##
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]On the Mechanism of Drag Reduction in Fully-Developed Turbulent Channel Flow with a Streamwise Micro-featured Superhydrophobic Wall22The superhydrophobic drag reduction changes the structures of turbulent flow. However, the underlying mechanism is not clear. The aim of this study is to determine the alternations of turbulent flow due to applying a streamwise micro-featured superhydrophobic wall. Large eddy simulations are performed to explore the effect of micro-features on near-wall behaviors. The results indicate that the outward motion of the lifted low-speed streaks is restricted to the lower wall layers, and the region of maximum production of streamwise vorticities is shifted toward the micro-featured wall. The quadrant analysis of Reynolds stress shows that there is a stronger increase in outward motion of high-speed fluid and inward motion of low-speed fluid than ejection and sweep.13631374M.Saadat-BakhshMechanical Engineering, Iran University of Science and TechnologyMechanical Engineering, Iran University of Science and TechnologyIran(ایران)a.saadatbakhsh@gmail.comN. M.Nourimnouri@iust.ac.irmnouri@iust.ac.irpaysmnouri@iust.ac.irH.NorouziMechanical Engineering, Iran University of Science and TechnologyMechanical Engineering, Iran University of Science and Technologypayshossein.norouzi91@gmail.comSuperhydrophobic surface Drag reduction mechanism Coherent structures Streak strength.[Busse, A. and N. D. Sandham (2012). Influence of an anisotropic slip-length boundary condition on turbulent channel flow. Physics of Fluids. 24(5), 055111.##
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]Aerodynamic Study of Two Opposing Moving Trains in a Tunnel Based on Different Nose Contours22It is well known that the train nose shape has significant influence on the aerodynamic characteristics. This study explores the influence of four kinds of nose shapes (fusiform, flat-broad, bulge-broad, ellipsoidal) on the aerodynamic performance of two opposing high-speed trains passing by each other through a tunnel at 250 km/h. The method of three dimensional, compressible, unsteady Reynolds-averaged Navier-Stokes equations and RNG k-ε double equation turbulence model was carried out to simulate the whole process of two trains passing by each other inside a tunnel. Then the pressure variations on tunnel wall and train surface are compared with previous full-scale test to validate the numerical method adopted in this paper. The assessment characteristics, such as transient pressure and aerodynamic loading, are analyzed to investigate the influence of nose shape on these assessment parameters. It is revealed that aerodynamic performance of trains which have longitudinal nose profile line B (fusiform, flat-broad shape) is relatively better when passing by each other in a tunnel. The results can be used as a guideline for high-speed train nose shape design.13751386W. H.LiKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South UniversityChina (中国)csu_lwh@qq.comT. H.LiuKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South Universitypaysjthjd@163.comJ.ZhangKey Laboratory of Traffic Safety on Track of Ministry of Education, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, Central South UniversityChina (中国)jie_csu@csu.edu.cnZ. W.ChenKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South Universitypayscsu_czw@qq.comX. D.ChenKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South Universitypayscsu_cxd1@qq.comT. Z.XieKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South Universitypayscsu_xtz@qq.comHigh-speed train (HST) Nose shape Railway tunnel Transient pressure Aerodynamic loading.[Choi J. K. and K. H. Kim (2014). Effects of nose shape and tunnel cross-sectional area on aerodynamic drag of train traveling in tunnels. Tunnelling & Underground Space Technology, 41, 62-73.##
Chu, C. R., S. Y. Chien, C. Y. Wang and T. R. Wu (2014). Numerical simulation of two trains intersecting in a tunnel. Tunnelling & Underground Space Technology 42(5), 161-174.##
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Gilbert, T., C. J. Baker and A. Quinn (2013). Gusts caused by high-speed trains in confined spaces and tunnels. Journal of Wind Engineering and Industrial Aerodynamics 121(5), 39-48.##
Hwang, J. and D. H. Lee (2013). Numerical simulation of flow field around high speed trains passing by each other. Fluids & Thermal Engineering 44(3), 451-464.##
Ikeda, M., K. Yoshida and M. Suzuki (2003). Optimization of panhead shape for high-speed train using CFD. Jointed railway technology symposium. The Japan Society of Mechanical Engineers.##
Kikuchi, K., M. Iida and T. Fukuda (2011). Optimization of train nose shape for reducing micro-pressure wave radiated from tunnel exit. Journal of low frequency noise vibration and active Control 30(1),1-19.##
Ko, Y. Y., C. H. Chen, I. T. Hoe and S. T. Wang (2012). Field measurements of aerodynamic pressures in tunnels induced by high speed trains. Journal of Wind Engineering and Industrial Aerodynamics 100(1), 19-29.##
Ku, Y. C., J. H. Rho and S. H. Yun (2010). Optimal cross-sectional area distribution of a high-speed train nose to minimize the tunnel micro-pressure wave. Structural & Multidisciplinary Optimization 42(6), 965-976.##
Kwon, H. B., T. Y. Kim, D. H. Lee and M. S. Kim (2003). Numerical simulation of unsteady compressible flows induced by a high-speed train passing through a tunnel. Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit 217(2),111-124.##
Lee, J. and J. Kim (2007). Approximate optimization of high-speed train nose shape for reducing micro pressure wave. Structural and Multidisciplinary Optimization 35(1),79-87.##
Li, R., W. Zhang, Z. Ning, B. Liu, D. Zou and W. Liu (2016). Influence of a high-speed train passing through a tunnel on pantograph aerodynamics and pantograph-catenary interaction. Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit 231(2), 198-210.##
Niu, J., D. Zhou, X. Liang, T. Liu and S. Liu (2017). Numerical study on the aerodynamic pressure of a metro train running between two adjacent platforms. Tunnelling & Underground Space Technology 65, 187-199.##
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Riccoa, P., A. Baronb and P. Moltenib (2007). Nature of pressure waves induced by a high-speed train travelling through a tunnel. Journal of Wind Engineering and Industrial Aerodynamics 95(8), 781-808.##
Wittkowski, M. (2015). Passenger comfort on high-speed trains: effect of tunnel noise on the subjective assessment of pressure variations. Ergonomics 58(6),1022-1031.##
Xiang, X. T. and L. P. Xue (2010). Tunnel hood effects on high speed train-tunnel compression wave. Journal of Hydrodynamics 22(5), 940-947.##
Yang, W. C., C. He and L. M. Peng (2013). The calculation of train slipstreams on platform of underground high-speed rail station. Advanced Materials Research 842, 445-448.##
Zhang, M. L., Y. R. Yang and L. Lu (2011). Numerical Simulation of Two High Speed Trains Passing by each other in a Long Tunnel. Applied Mechanics and Materials, 117-119(11), 670-673.##
]Modified Model for Binary Nanofluid Convection with Initial Constant Nanoparticle Volume Fraction22A modified model considering effects of density as well as conductivity of nanoparticles is used to investigate the instability of a binary nanofluid layer. It is assumed that volume fraction of nanoparticles is small and remains constant at the initial state which leads to very interesting and useful results. The perturbed equations so found are analyzed using normal modes and weighted residual method. It is found that oscillatory motions are not possible and instability is invariably through stationary mode. After solving the problem analytically, numerical solutions are found for metallic (aluminium, copper, silver, iron) and non-metallic (alumina, silica, titanium oxide, copper oxide) nanoparticles using the software Mathematica. The effects of size of nanoparticles, difference in solute concentration, volume fraction of nanoparticles, difference in temperature, conductivity and density of nanoparticles are studied on the onset of convection. The increase in density of nanoparticles destabilizes the fluid layer system where as increase in conductivity stabilizes the same. Lower density of aluminium makes it more stable than other nanoparticles in spite of having its lower conductivity. Metals are largely more stable than non-metals. 13871395J.SharmaU.I.E.T., Panjab University, ChandigarhU.I.E.T., Panjab University, ChandigarhINDIAjyoti.maths@gmail.comU.GuptaDr. S. S. Bhatnagar University Institute of Chemical Engineering and Technology, Panjab UniversityDr. S. S. Bhatnagar University Institute of Chemical Engineering and Technology, Panjab UniversityINDIAdr_urvashi_gupta@yahoo.comV.SharmaDepartment of Mathematics, Himachal Pradesh UniversityDepartment of Mathematics, Himachal Pradesh Universitypaysveena_math_hpu@yahoo.comBinary convection Brownian motion Thermophoresis Metallic and Non-metallic nanoparticles Dufour and soret effects.[Agarwal, S. (2014). Natural convection in a nanofluid-saturated rotating porous layer: a more realistic approach. Transp Porous Media 104, 581-592.##
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Anwar Beg, O., M. M. Rashidi, M. Akbari and A. Hosseini (2014). Comparative numerical study of single-phase and two-phase models for bio-nanofluid transport phenomena, Journal of Mechanics in Medicine and Biology 14 (1), 14500110.##
Buongiorno, J. (2006). Convective transport in nanofluids. ASME Journal of Heat Transfer 128 (3), 240-250.##
Chand, R. and G. C. Rana (2015). Magneto convection in a layer of nanofluid in porous medium-a more realistic approach, J Nanofluids 4, 196–202.##
Choi, S. (1995). Enhancing thermal conductivity of fluids with nanoparticles, In:. Siginer, D. A., Wang, H.P. (Eds.), Development and Applications of Non-Newtonian flows, ASME FED- 231/MD- 66, 99-105.##
Garoosi, F., B. Rohani and M. M. Rashidi (2015a). Two-phase mixture modeling of mixed convection of nanofluids in a square cavity with internal and external heating, Advanced Powder Technology 275, 304–321.##
Garoosi, F., L. Jahanshaloo, M. M. Rashidi, A. Badakhsh and M. A. Ali (2015b). Numerical Simulation of Natural Convection of the Nanofluid in Heat Exchangers using a Buongiorno Model, Applied Mathematics and Computation 254, 183–203.##
Gupta, U., J. Ahuja and R. K. Wanchoo (2013). Magneto convection in a nanofluid layer. Int. J. Heat and Mass Transfer 64, 1163–1171.##
Gupta, U., J. Sharma and V. Sharma (2015). Instability of binary nanofluid with magnetic field. Applied Mathematics and Mechanics 36 (6), 693-706.##
Gupta, U., J. Sharma and R. K. Wanchoo (2014). Thermosolutal convection in a horizontal nanofluid layer: Introduction of oscillatory motions. Recent Advances in Engineering and Computation Sciences, IEEE, Chandigarh, India Print.##
Jang, S. P. and S. U. S Choi (2007). Effects of various parameters on nanofluid thermal conductivity. Journal of Heat Transfer 129, 617-623.##
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Nield, D. A. and A. V. Kuznetsov (2014b). The onset of convection in a horizontal nanofluid layer of finite depth: A revised model. Int. J. Heat Mass Transfer 77, 915–918.##
Nield, D. A. and A. V. Kuznetsov (2014a). Thermal instability in a porous medium layer saturated by a nanofluid: a revised model. Int J Heat Mass Transfer 68, 211–214.##
Nield, D. A. and A. V. Kuznetsov (2009). Thermal instability in a porous medium layer saturated by a nanofluid. Int. J. Heat and Mass Transfer 52, 5796–5801.##
Nield, D. A. and A.V. Kuznetsov (2010). The onset of convection in a horizontal nanofluid layer of finite depth. European J. Mech, B/Fluids 29, 217–223.##
Seth, G. S. and M. K. Mishra (2017). Analysis of transient flow of MHD nanofluid past a non-linear stretching sheet considering Navier’s slip boundary condition. Advanced Powder Technology 28 (2), 375–384.##
Seth, G. S., M. K. Mishra and A. J. Chamkha (2016). Hydromagnetic convective flow of viscoelastic nanofluid with convective boundary condition over an inclined stretching sheet. J. Nanofluids 5, 511–521.##
Seth, G. S., R. Sharma, M. Kumar Mishra and A. J Chamkha (2017). Analysis of hydromagnetic natural convection radiative flow of a viscoelastic nanofluid over a stretching sheet with Soret and Dufour effects. Engineering Computations 34(2), 603-628.##
Sharma, J., U. Gupta and R. K. Wanchoo (2016). Numerical Study on Binary Nanofluid Convection in a Rotating Porous Layer, Differ Equ Dyn Syst.##
Sheikholeslami, M., M. M. Rashidi, T. Hayat and D. D. Ganji (2016). Free convection of magnetic nanofluid considering MFD viscosity effect, Journal of Molecular Liquids 218, 393–399.##
Turkyilmazoglu, M. (2012). Exact analytical solutions for heat and mass transfer of MHD slip flow in nanofluids. Chemical Engineering Science 84, 182–187.##
Yadav, D. and J. Lee (2016). Onset of convection in a nanofluid layer confined within a Hele-Shaw cell. Journal of Applied Fluid Mechanics 9(2), 519-527.##
Yadav, D., G. S. Agrawal and R. Bhargava (2012). The onset of convection in a binary nanofluid saturated porous layer. Int. J. Theoretical and Applied Multiscale Mechanics 2(3), 198-224.##
]Prediction of Cavitation Performance of Radial Flow Pumps22Cavitation is a major problem in pump design and operation because this phenomenon may lead to various types of instabilities, including hydraulic performance loss and catastrophic damage to the pump material caused by bubble collapse. Therefore, it is critical to predict the cavitation performance of the pump in the design phase itself. The motivation of this study is to develop a systematic methodology to calculate the cavitation performance of radial flow pumps. In the first step of the present work, a cavitating nozzle flow case for which the bubble dynamic behavior is accurately resolved in literature is studied numerically. Subsequently, the capabilities of three cavitation models, implemented in the commercial code Fluent, are evaluated for three radial flow pumps designed at specific speeds ns = 10.4, 22.4, and 34.4. The numerical results are validated with global quantities based on net positive suction head (NPSH) measurements. The results led to the determination of reasonably accurate NPSH values for the defined range of specific speeds. 13971408M.Kaya1R and D Department, Standart Pompa A.S., Istanbul1R and D Department, Standart Pompa A.S., IstanbulTurkey (Türkiye)kayamehmet12346@itu.edu.trE.AyderMechanical Engineering Department, Istanbul Technical UniversityMechanical Engineering Department, Istanbul Technical Universitypaysaydere@itu.edu.trNPSH Cavitation Pump Bubble dynamics.[Balasubramanian, R., E. Sabini and S. Bradshaw (2011). Influence of impeller leading edge profiles on cavitation and suction performance. Proceedings of the 27th Int. Pump Users Symp. , Houston, Texas.##
Coutier-Delgosha, O., R. Fortes-Patella and J. L. Reboud (2003). Evaluation of the turbulence model influence on the numerical simulations of unsteady cavitation. Journal of Fluids Engineering 125, 38-45##
Ding, H., F. C. Visser, Y. Jiang and M. Furmanczyk (2011). Demonstration and validation of a 3D CFD simulation tool predicting pump performance and cavitation for industrial applications. Journal of Fluids Engineering 133, 011101-1-14.##
Dupont, P. (2001). Numerical prediction of the cavitation in pumps. Proceedings of the 18th Int. Pump Users Symp., Houston, Texas.##
Hirschi, R., P. Dupont, F. Avellan, J. N. Favre, J. F. Guelich and E. Parkinson (1998). Centrifugal pump performance drop due to leading edge cavitation numerical predictions compared with model tests. Journal of Fluids Eng. 120, 705-711##
Jeanty, F., J. De Andrade, M. Asuaje, F. Kenyery A. Vasques, O. Aguillon and A. Tremante (2009). Numerical simulation of cavitation phenomena in a centrifugal pump. Proceedings of the ASME FEDSM2009, Vail, Colorado.##
Li, W. G. (2014). Validating full cavitation model with an experimental centrifugal pump. Task Quarterly 18(1), 81-100.##
Marini, A., S. Salvadori, C. Bernardini, M. Insinna, F. Martelli, A. Nicchio and A. Piva (2011). Numerical prediction of cavitation inception in centrifugal impellers. Proceedings of the 9th European Conference on Turbomachinery, Istanbul, Turkey.##
Niedzwiedzka, A., G. H. Schnerr and W. Sobieski (2016). Review of numericals models of cavitating flows with the use of homogeneous approach. Archives of Thermodynamics 37(2), 71-88##
Nohmi, M. (2012). A review a basic research on total prediction system for cavitation phenomena. Proceedings of the 8th Int. Symp. on Cavitation, Singapore.##
Schnerr, G. H. and J. Sauer (2001). Physical and numerical modeling of unsteady cavitation dynamics. Proceedings of the 4th ICMF, New Orleans, USA##
Shukla, S. N. and J. Kshirsagar (2008). Numerical prediction of cavitation in model pump. Proceedings of the IMECE2008, Boston, Massachusetts.##
Singhal, A. K., Athavale, M. M., H. Li and Y. Jiang (2002). Mathematical basis and validation of the full cavitation model. Journal of Fluids Eng. 124, 617-624.##
Tran, T. D., B. Nennemann, T. C. Vu and F. Guibault (2015). Investigation of cavitation models for steady and unsteady cavitating flow simulaion. Int. J. of Fluid Mac. and Sys. 8(4), 240-253.##
Visser, F. C. (2001). Some user experience demonstrating the use of CFD for cavitation analysis and head prediction of centrifugal pump. Proceedings of the 4th ASME Int. Symp. on Pumping Mach., New Orleans, Louisiana.##
Wang, Y.C., Brennen, C.E. (1998) One-Dimensional Bubbly Cavitating Flows Through a Converging-Diverging Nozzle. ASME J. Fluids Eng. 120, 166–170.##
Zhang, D., W. Shi, D. Pan and M. Dubuisson (2015). Numerical and experimental investigation of tip leakage vortex cavitation patterns and mechanisms in an axial flow pump. Journal of Fluids Engineering 137, 121103-1-14##
Zwart, P. J., A. G. Gerber and T. Belamri (2004). A two-phase flow model for predicting cavitation dynamics. Proceedings of the 5th ICMF, Yokohama.##
]Determination of the Modes and the Conditions of Ultrasonic Spraying Providing Specified Productivity and Dispersed Characteristics of the Aerosol22For the spraying of liquids and the coating process at high-tech productions the method of ultrasonic spraying in a layer having a number of advantages such as low energy capacity, high productivity, fine-dispersity of obtained aerosol and the absence of spraying agent, is used. However the main problem of ultrasonic spraying application is the absence of the reliable dependences of spraying characteristics (drop diameter and spraying productivity) on the liquid properties (viscosity, surface tension), modes (frequency and vibration amplitude of spraying surface) and conditions (the thickness of liquid layer) of the ultrasonic action. In order to determine these dependences it is proposed the model based on cavitation and wave theory of the drop formation, which allows obtain for the first time theoretical ground of the existence of optimum thickness layer, at which free surface of liquid is acted upon by maximum energy providing drop detachment. The model analysis lets show advisability of the application of vibration frequency of more than 100 kHz for the drop generation with the size of 10 μm and less with the productivity of no less than 0.2 ml/s. Obtained results are proved by the experimental studies, which allow their use for the formulation of the technical requirements to the ultrasonic sprayers at the realization of different technological processes.
14091419V. N.KhmelevBiysk Technological Institute (branch) of Altai State Technical UniversityBiysk Technological Institute (branch) of Altai State Technical Universitypaysvnkhmelev57@gmail.comA. V.ShalunovBiysk Technological Institute (branch) of Altai State Technical UniversityBiysk Technological Institute (branch) of Altai State Technical Universitypaysavshalunov80@mail.ruR. N.GolykhBiysk Technological Institute (branch) of Altai State Technical University named after I.I. PolzunoBiysk Technological Institute (branch) of Altai State Technical University named after I.I. PolzunoRussia (Россия)romangl90@gmail.comV. A.NesterovBiysk Technological Institute (branch) of Altai State Technical UniversityBiysk Technological Institute (branch) of Altai State Technical Universitypaysisis.bti@mail.ruR. S.DorovskikhBiysk Technological Institute (branch) of Altai State Technical UniversityBiysk Technological Institute (branch) of Altai State Technical Universitypaysramses98@mail.ruA. V.ShalunovaBiysk Technological Institute (branch) of Altai State Technical UniversityBiysk Technological Institute (branch) of Altai State Technical Universitypaysgrn@bti.secna.ruUltrasound Spraying Viscosity Aerosol Thickness of the layer Capillary wave.[Aliseda, A., E. J. Hopfinger, J. C. Lasheras, D. M. Kremer, A. Berchielli and E. K. Connolly (2008). Atomization of viscous and non-newtonian liquids by a coaxial, high-speed gas jet. Experiments and droplet size modelling. International Journal of Multiphase Flow 34, 161–175.##
Balik, G. (2014). The use of air atomizing nozzles to produce sprays with fine droplets. 14th International Water Mist Conference 7 p.##
Donnelly, T. D., J. Hogan, A. Mugler, M. Schubmehl, N. Schommer, A. J. Bernoff, S. Dasnurkar and T. Ditmire (2005). Using ultrasonic atomization to produce an aerosol of micron-scale particles. Review of scientific instruments 113301-1–113301-10.##
Eggers, J. (1997). Nonlinear dynamics and breakup of free-surface flows. Review of Modern Physics 69(3), 865–929.##
Ehrhorn, J. and W. Semke (2014). Numerical prediction of vibration induced liquid atomization. Int.J.Nov.Res.Eng. and Pharm.Sci. 1 (03), 1–9.##
Khmelev, V. N, A. V. Shalunov, A. V. Shalunova, R. N. Golykh and D. V. Genne (2012a). The Investigation of Modes of Ultrasonic Influence on Atomization of Liquids with Specified Dispersivity and Productivity. International Conference and Seminar on Micro / Nanotechnologies and Electron Devices. EDM'2012: Conference Proceedings, Novosibirsk, Russia.##
Khmelev, V. N., A. V. Shalunov, D. V. Genne, R. N. Golykh and A. V. Shalunova (2011). Development and study of new principles of design of fine-dispersed ultrasonic sprayers of viscous liquids. Bulletin of the Tomsk Polytechnical University 319(4), 158–163.##
Khmelev, V. N., A. V. Shalunov, S. S. Khmelev, and S. N. Tsyganok (2015a). Ultrasound. Apparatuses and technologies. Altay State Technical University Publishing, Biysk, Russia.##
Khmelev, V. N., A. V. Shalunov, V. A. Nesterov, D.S. Abramenko, D. V. Genne and R. S. Dorovskikh (2014). Automated line for ultrasonic spraying of anticoagulant into the blood collection tubes. EDM'2014: Conference Proceedings, Novosibirsk.##
Khmelev, V. N., R. N. Golykh, A. V. Shalunov, A. V. Shalunova and D. V. Genne (2012c). The investigation of modes of ultrasonic influence for atomization of liquids with specified dispersivity and productivity. International Conference and Seminar on Micro / Nanotechnologies and Electron Devices. EDM'2012: Conference Proceedings, Novosibirsk.##
Khmelev, V. N., R. N. Golykh, A. V. Shalunov, V. E. Bazhin and V. A. Nesterov (2015b). Determination of Optimum Conditions of Ultrasonic Cavitation Treatment of High-viscous and Non-newtonian liquid media. 16th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices. EDM'2015: Conference Proceedings. Novosibirsk.##
Khmelev, V. N., R. N. Golykh and A. V. Shalunov (2012b). Optimization of these modes and conditions of ultrasonic influence on various technological mediums by mathematical modeling. EDM'2012: Conference Proceedings, Novosibirsk.##
Lugovskoy, A. and A. Lyashok (2013). Physical analogue of the process of ultrasonic liquid nebulisation in a thin layer. Journal of mechanical engineering NTUU Kyiv Polytechnic Institute 110–114.##
Simon, J. C., O. A. Sapozhnikov, V. A. Khokhlova, L. A. Crum and M. R. Bailey (2015). Ultrasonic atomization of liquids in drop-chain acoustic fountains. J. Fluid Mech. 766, 129–146.##]Oscillating Motion of an Oldroyd-B Fluid with Fractional Derivatives in a Circular Cylinder22The velocity field and tangential shear stress for unsteady flow of an Oldroyd-B fluid with Caputo fractional derivatives through an infinite long cylinder are evaluated. The fluid in the infinitely long cylinder is initially at rest and at t = 0+, due to shear, the fluid starts to oscillate longitudinally. We have solved the fractional model with the tool of Laplace and finite Hankel transformations. The solutions are in series form and are written in generalized G-function to avoid the entanglement. In limiting cases, the solutions of ordinary Oldroyd-B fluid, Maxwell fluid with fractional as well as ordinary and Newtonian fluid are derived. Finally, behavior of different physical parameters on fluid is illustrated by graphs.14211426N.RazaDepartment of Mathematics, University of the Punjab, Quaid-e-Azam CampusDepartment of Mathematics, University of the Punjab, Quaid-e-Azam CampusPakistan (پاکستان)raza_nauman@yahoo.comE. U.HaqDepartment of Mathematics and Statistics, The University of LahoreDepartment of Mathematics and Statistics, The University of Lahorepaysehsan_math2785@yahoo.comM. M.RashidiUniversity of Birmingham, School of Civil Engineering, BirminghamUniversity of Birmingham, School of Civil Engineering, Birminghampaysmm_rashidi@tongji.edu.cnA. U.AwanDepartment of Mathematics, University of the Punjab, Quaid-e-Azam CampusDepartment of Mathematics, University of the Punjab, Quaid-e-Azam Campuspaysaziz.math@pu.edu.pkM.AbdullahDepartment of Mathematics, University of Engineering and TechnologyDepartment of Mathematics, University of Engineering and Technologypaysabdul4909@gmail.comOldroyd-B fluid Tangential stress Longitudinal oscillation Velocity field Laplace transformation Hankel transformation.[Abbasbandy, S., T. Hayat, A. Alsaedi and M. M. Rashidi (2013). Numerical and analytical solutions for falknerskan flow of MHD Oldroyd-B fluid. Inter. J. Numer. Meth. Heat and Fluid Flow. 24, 390–401.##
Awan, A. U., C. Fetecau and Q. Rubab (2010). Axial Couette flow of a generalized Oldroyd-B fluid due to a longitudinal time-dependent shear stress. Quest. Math. 33, 429–441.##
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]Massline Visualization of Double-Diffusive Natural Convection inside a Cavity Filled with Nanofluid Subjected to Heat Flux and Transverse Magnetic Field22In the present work, massline visualization technique as an innovative method is utilized to deepen our insights into the problem of double-diffusive natural convection of nanofluids. The effects of inclination angle and strength of the external magnetic field on one side and heat flux coefficient on the other side on the masslines, isoconcentrations, isotherms, heat and mass transfer are fairly studied and discussed. The governing equations together with appropriate boundary conditions are solved numerically using a finite difference method in a square lid-drive cavity filled with Cu-water nanofluid. Four pertinent parameters are studied these; the orientation angle of the magnetic field (λ = 0◦ − 270◦), Hartman number (Ha = 0 − 100), heat flux coefficient (ε= 1 − 200), and nanoparticle volume fraction (ϕ = 0 − 10%). Results indicate that the orientation and strength of applied magnetic field can be considered as the key parameters in controlling double-diffusive natural convection. It is also found that the existence of metallic nanoparticles in the presence of magnetic field can play different roles in the heat and mass transfer variations. Meanwhile, high amount of heat flux injected through the cavity has an aiding effect on the convective current of mass within the cavity. Results also indicate that nanofluid has relatively smaller massline circulation loops than pure fluid.14271440O.GhaffarpasandDepartment of Physics, University of IsfahanDepartment of Physics, University of IsfahanIran(ایران)o.ghaffarpasand@gmail.comDouble-diffusive natural convection Nanofluid Heat flux Massline visualization technique Heat and mass transfer.[Al-Amiri A., K. Khanafer, K., J. Bull and I. Pop (2007). Numerical simulation of combined thermal and mass transport in a square lid-driven cavity. International Journal of Thermal Science 46, 662-671.##
Alim, M. A. and R. Nasrin (2013). Modelling of double-diffusive buoyant flow in a solar collector with water-CuO nanofluid. Heat Transfer-Asian Research 42, 212-229.##
Alsabery, A. I., A. J. Chamkha, S. H. Hussain, H. Saleh and I. Hashim (2016). Heatline visualization of conjugate natural convection in a square cavity filled with nanofluid with sinusoidal temperature variations on both horizontal walls. International Journal of Heat and Mass Transfer 100, 835-850.##
Aly, AM. and Z. A. S. Raizah (2016). Double-diffusive natural convection in an enclosure filled with nanofluid using ISPH method. Alexandria Engineering Journal 55, 3037-3052.##
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]Dynamic Simulation in Guide Vane Opening Process of a Pump-Turbine in Pump Mode22During the process of switching conditions in pump-turbine, unstable ﬂow would take place and seriously impact on the stability and safety. This paper deals with the guide vanes’ moving process in pump mode through unsteady numerical simulations. Dynamic mesh methodology is used for simulations in which GVO (Guide Vane Opening) from 9mm to 26mm. Simulation results approve that, there are many complex vortex structures and ﬂow blockages phenomena under small GVO condition. Through the mathematical method of Fast Fourier Transform (FFT) and Short-Time Fourier Transform (STFT), the dominant pressure ﬂuctuation frequencies are from runner blade passing frequency (BPF) and its harmonic frequency, as well as some other low frequencies are from unsteady ﬂow states. Furthermore, the ﬂow states are more unstable and complex under small guide vanes moving process. Compared with ﬁxed GVO position, the ﬂow states are more unstable and complex under guide vanes moving process, while the amplitude of main frequencies becomes higher.14411449L.HanSchool of Energy Science and Engineering, Harbin Institute of TechnologySchool of Energy Science and Engineering, Harbin Institute of TechnologyFrancehanleilyon@hotmail.comH. J.Wang1Department of Energy Science and Engineering, Harbin Institute of Technology, Harbin1Department of Energy Science and Engineering, Harbin Institute of Technology, HarbinChina (中国)wanghongjie@hit.edu.cnY. H.GaoSchool of Energy Science and Engineering, Harbin Institute of TechnologySchool of Energy Science and Engineering, Harbin Institute of Technologypaysgao@jafmonline.netD. Y.LiSchool of Energy Science and Engineering, Harbin Institute of TechnologySchool of Energy Science and Engineering, Harbin Institute of Technologypayslideyou@hit.edu.cnR. Z.Gong1Department of Energy Science and Engineering, Harbin Institute of Technology, Harbin1Department of Energy Science and Engineering, Harbin Institute of Technology, Harbinpaysgongruzhi@hit.edu.cnX. Z.WeiState Key Laboratory of Hydro-Power Equipment, Harbin Institute of Large Electrical MachineryState Key Laboratory of Hydro-Power Equipment, Harbin Institute of Large Electrical Machinerypaysweixianzhu@hit.edu.cnPump turbine Pressure ﬂuctuation Dynamic mesh Guide vane opening.[Ciocan, G. D. and J. Kueny (2006). Experimental analysis of rotor stator interaction in a pump-turbine. In Proc. XXIII IAHR Symposium on Hydraulic Machinery and Systems, Yokohama, Japan.##
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Egusquiza, E., B. Mateos and X. Escaler (2002). Analysis of rotor-stator interaction in operating pump-turbines. In Proceedings of the XXI IAHR Symposium on Hydraulic Machinery and Systems.##
Gao, H., F. Gao, X. Zhao, J. Chen and X. Cao (2013). Analysis of reactor coolant pump transient performance in primary coolant system during start-up period. Annals of Nuclear Energy 54, 202–208.##
Gu, Y. and M. Bollen (2000). Time- frequency and time-scale domain analysis of voltage disturbances. Power Delivery, IEEE Transactions on 15(4), 1279–1284.##
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]Simulation of Imbibition Phenomena in Fluid Flow through Fractured Heterogeneous Porous Media with Different Porous Materials22In this paper, the counter – current imbibition phenomenon in a fractured heterogeneous porous media is studied with the consideration of different types of porous materials like volcanic sand and fine sand and Adomian decomposition method is applied to find the saturation of wetting phase and the recovery rate of the reservoir. A simulation result is developed to study the saturation of wetting phase in volcanic as well as in fine sand with the recovery rate of the oil reservoir with the choices of some interesting parametric value. This problem has a great importance in the oil recovery process.14511460H. S.PatelApplied Mathematics and Humanities Department, S. V. National Institute of TechnologyApplied Mathematics and Humanities Department, S. V. National Institute of Technologypayshardy.nit@gmail.comR.MeherApplied Mathematics and Humanities Department, S. V. National Institute of TechnologyApplied Mathematics and Humanities Department, S. V. National Institute of Technologypaysmeher_ramakanta@yahoo.comCounter–current imbibition Fracture porous media Brooks corey model Adomian decomposition method.[Adomian, G. (1994). Solving frontier problems of physics the decomposition method. Springer.##
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]Aerodynamically Efficient Rotor Design for Hovering Agricultural Unmanned Helicopter22Unmanned aerial vehicles, especially agricultural unmanned helicopters (AUH), are nowadays extensively used in precision agriculture. AUHs have recently become responsible for spraying fertilizers and pesticides for crop yields. The strong downward rotating flow produced by the main rotor helps very uniform crop spraying which determines that how important is the aerodynamics of rotor blade in AUH. In this work, the aerodynamic performance of AUH rotor blades is evaluated and an efficient blade is obtained by numerically investigating the influence of design variables on the aerodynamics of rotor blades. The design variables consist of airfoil shape, pitch settings, and twist angle. The limited power available in hover and aerodynamic requirements (lift and drag) are the aerodynamic constraints. This analysis only considers the hovering flight condition at a constant rotational speed. The aerodynamically efficient rotor blade which is based on gradually varying and linearly twisted airfoil shapes, show a significant improvement in hover performance with relatively uniform blade loading. After testing, the optimum blade can be used as the main rotor in the AUH to perform precision farming.14611474B. A.HaiderSchool of Mechanical Engineering, Kyungpook National UniversitySchool of Mechanical Engineering, Kyungpook National UniversitySouth Korea (한국)haiderbasharatali@gmail.comC. H.SohnSchool of Mechanical Engineering, Kyungpook National UniversitySchool of Mechanical Engineering, Kyungpook National Universitypayschsohn@knu.ac.krY. S.WonSchool of Agricultural Civil and Bio-Industrial Engineering, Kyungpook National UniversitySchool of Agricultural Civil and Bio-Industrial Engineering, Kyungpook National Universitypaysrawesy@naver.comY. M.KooSchool of Agricultural Civil and Bio-Industrial Engineering, Kyungpook National UniversitySchool of Agricultural Civil and Bio-Industrial Engineering, Kyungpook National Universitypaysymkoo@knu.ac.krAgricultural unmanned helicopter Airfoil Computational fluid dynamics Hover performance Rotor blade optimization.[Adeeb, E., A. Maqsood, A. Mushtaq and C. Sohn (2016). Parametric study and optimization of ceiling fan blades for improved aerodynamic performance. Journal of Applied Fluid Mechanics 9(6), 2905–2916.##
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