Studies on the Effect of Baffle Plates in Settling Chamber Performance by CFD and Experimental Analysis

Document Type : Regular Article

Authors

1 Department of Mechanical Engineering, Sri Eshwar College of Engineering, Coimbatore, India

2 Department of Mechanical Engineering, College of Engineering and Technology, Dambi Dollo University, Ethiopia

3 Department of Mechanical Engineering, Karpagam Academy of Higher Education, Coimbatore, India

10.47176/jafm.18.3.2831

Abstract

The performance of the settling chamber was examined in two scenarios in this study. In case 1, the settling chamber collection efficiency and flow characteristics were predicted without a baffle plate. In case 2, the settling chamber performance was predicted with the baffle plates. In case 2, two baffle plates were placed between the inlet and exit nozzle. The experimental set up was fabricated with the baffle plates to measure the performance. Moreover, the efficiency of the settling chamber was determined for the different inlet velocities. The Variable Frequency Drive (VFD) controller was adopted with the suction fan to vary the inlet velocity. The Reynolds Stress Model (RSM) was used to forecast the settling chamber flow characteristics. In cases 1 and 2, the best capture efficiency results were achieved at 2.5 m/s inlet velocity. The experimental study shows that the settling chamber gathering efficiency was 45% at 52.35µm. It is 44.4% higher than case 1. In CFD analysis, the settling chamber efficiency was 43%. The variation between the experimental and CFD results was 4.4%. The observations show that the pressure drop for the baffle plate setting chamber was increased 4.37 % compared to case1. The maximum settling velocity of the case 1 and case 2 chambers is 1.62 m/s and 2.81 m/s respectively. It indicates that the baffle plate chamber has highest setting velocity. Moreover, the hopper region has highest tangential velocity when introducing the baffle plate. The observations show that the radial velocity is increased in the rectangular wall region compared to hopper region due to the baffle plate.

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References

Bhattacharjee, R. C. (2003). Optimal design of a settling chamber-an air pollution control device. WIT Transactions on Ecology and the Environment, 66. 1-10. https://doi.org/ 10.2495/AIR030521
Chuah, T. G., Gimbun, J., & Choong, T. S. (2006). A CFD study of the effect of cone dimensions on sampling aerocyclones performance and hydrodynamics. Powder Technology, 162(2), 126-132. https://doi.org/10.1016/j.powtec.2005.12.010
Elsayed, K., & Lacor, C. (2010). Optimization of the cyclone separator geometry for minimum pressure drop using mathematical models and CFD simulations. Chemical Engineering Science, 65(22), 6048-6058. https://doi.org/10.1016/j.ces.2010.08.042Get rights and content
Elsayed, K., & Lacor, C. (2012). The effect of the dust outlet geometry on the performance and hydrodynamics of gas cyclones. Computers & Fluids, 68,134-147. https://doi.org/10.1016/j.compfluid.2012.07.029
Fatahian, H., Fatahian, E., & Nimvari, M. E. (2018). Improving efficiency of conventional and square cyclones using different configurations of the laminarizer. Powder Technology, 339, 232-243. https://doi.org/10.1016/j.powtec.2018.08.038
Feather, G. A., & Chen, B. T. (2003). Design and use of a settling chamber for sampler evaluation under calm-air conditions. Aerosol Science & Technology, 37(3), 261-270. https://doi.org/10.1080/02786820300946
Flagan, R. C., & Seinfeld, J. H. (1988). Removal of particles from gas streams. Fundamentals of Air Pollution Engineering. Prentice-Hall, Inc., Englewood Cliffs, NJ.
Fluent, Inc., Fluent 6.1.22 Users' Guide. (2004).
Griffiths, W. D., & Boysan, F. (1996). Computational fluid dynamics (CFD) and empirical modelling of the performance of a number of cyclone samplers. Journal of Aerosol Science, 27(2), 281-304. https://doi.org/10.1016/0021-8502(95)00549-8
Houben, J. J. H., Weiss, C., & Brunnmair, E. (2016). CFD simulations of pressure drop and velocity field in a cyclone separator with central vortex stabilization rod. Journal of Applied Fluid Mechanics, 9(1), 487-499. https://doi.org/10.18869/ACADPUB.JAFM.68.224.23934
Kolaitis, D. I., & Founti, M. A. (2002). Modeling of the gas–particle flow in industrial classification chambers for design optimization. Powder Technology, 125(2-3), 298-305. https://doi.org/10.1016/S0032-5910(01)00518-6
Launder, B. E., & Shima, N. (1989). Second-moment closure for the near-wall sublayer-development and application. AIAA Journal, 27(10), 1319-1325. https://doi.org/10.2514/3.10267
Launder, B. E., & Spalding, D. B. (1983). The numerical computation of turbulent flows. Numerical prediction of flow, heat transfer, turbulence and combustion (pp.96-116). Pergamon. https://doi.org/10.1016/B978-0-08-030937-8.50016-7
Liu, X., Zhang, Y., Wu, Q., Zhang, M., Liu, F., & Guo, Y. (2019). Study on the key structure parameters of a gravity settling chamber based on a flow field simulation. Engineering Applications of Computational Fluid Mechanics, 13(1), 377-395. https://doi.org/10.1080/19942060.2019.1595729  
Morsi, S. A. J., & Alexander, A. J. (1972). An investigation of particle trajectories in two-phase flow systems. Journal of Fluid Mechanics, 55(2), 193-208. https://doi.org/10.1017/S0022112072001806
Nasiri, A., & Abdolzadeh, M. (2019). Effect of baffle arrangement and inlet air velocity on particulate removal efficiency of a gravitational settling chamber in a coke-making plant. International Journal of Coal Preparation and Utilization 39و 347-372. https://doi.org/10.1080/19392699.2017.1333114
Nieto, P. G., del Coz Díaz, J. J., Castro-Fresno, D., & Muñoz, F. B. (2010). Numerical simulation of the performance of a snow fence with airfoil snow plates by FVM. Journal of Computational and Applied Mathematics, 234(4),1200-1210. https://doi.org/10.1016/j.cam.2009.07.048
Patro, B., Kupireddi, K. K., & Devanuri, J. K. (2023). Heat transfer and pressure drop studies of vertical gas-particle flow using a variable gas property two-fluid model. Iranian Journal of Science and Technology, Transactions of Mechanical Engineering, 47(3),893-903. https://doi.org/10.1007/s40997-022-00561-6
Rajmistry, S., Ganguli, S., Chandra, P., Karmakar, M. K., & Chatterjee, P. (2017). Numerical analysis of gas-solid behavior in a cyclone separator for circulating fluidized bed system. Journal of Applied Fluid Mechanics, 10(4), 1167-1176. https://doi.org/10.18869/acadpub.jafm.73.241.26951
Raoufi, A., Shams, M., & Kanani, H. (2009). CFD analysis of flow field in square cyclones. Powder Technology, 191(3),349-357. https://doi.org/10.1016/j.powtec.2008.11.007
Roache, P. J. (1994). Perspective: a method for uniform reporting of grid refinement studies. Journal of Fluids Engineering, 116, 405-413.  https://doi.org/10.1115/1.2910291
Romblad, J., Greiner, M., Guissart, A., & Würz, W. (2022). Characterization of low levels of turbulence generated by grids in the settling chamber of a laminar wind tunnel. Experiments in Fluids, 63(4), 65. https://doi.org/10.1007/s00348-022-03418-5
Safikhani, H., Akhavan-Behabadi, M. A., Nariman-Zadeh, N., & Abadi, M. M. (2011a). Modeling and multi-objective optimization of square cyclones using CFD and neural networks. Chemical Engineering Research and Design, 89(3), 301-309. https://doi.org/10.1016/j.cherd.2010.07.004
Safikhani, H., Shams, M., & Dashti, S. (2011b). Numerical simulation of square cyclones in small sizes. Advanced Powder Technology, 22(3), 359-365. https://doi.org/10.1016/j.apt.2010.05.003
Sahmel, J., Avens, H. J., Scott, P. K., Unice, K., Burns, A., Barlow, C. A., & Paustenbach, D. J. (2015). Measured removal rates of chrysotile asbestos fibers from air and comparison with theoretical estimates based on gravitational settling and dilution ventilation. Inhalation Toxicology, 27(14), 787-801. https://doi.org/10.3109/08958378.2015.1110216
Sinnott, R. (2005). Chemical engineering design: chemical engineering. Volume 6. Elsevier.
Slack, M. D., Prasad, R. O., Bakker, A., & Boysan, F. (2000). Advances in cyclone modelling using unstructured grids. Chemical Engineering Research and Design, 8(78), 1098-1104. https://doi.org/10.1205/026387600528373  
Su, Y., Zheng, A., & Zhao, B. (2011). Numerical simulation of effect of inlet configuration on square cyclone separator performance. Powder Technology, 210(3), 293-303.  https://doi.org/10.1016/j.powtec.2011.03.034
Venkatesh, S., & Sakthivel, M. (2017). Numerical investigation and optimization for performance analysis in Venturi inlet cyclone separator. Desalination and Water Treatment, 90, 168-179. https://doi.org/10.5004/dwt.2017.21444
Venkatesh, S., Sivapirakasam, S. P., Sakthivel, M., Krishnaraj, R., & Leta, T. J. (2021). Investigation on hydrocyclone for increasing the performance by modification of geometrical parameters through cfd approach. Desalin. Water Treat, 244, 157-166. https://doi.org/10.5004/dwt.2021.27944
Wasilewski, M., Brar, L. S., & Ligus, G. (2020). Experimental and numerical investigation on the performance of square cyclones with different vortex finder configurations. Separation and Purification Technology, 239,116588. https://doi.org/10.1016/j.seppur.2020.116588
Zhao, B., Su, Y., & Zhang, J. (2006). Simulation of gas flow pattern and separation efficiency in cyclone with conventional single and spiral double inlet configuration. Chemical Engineering Research and Design, 84(12),1158-1165. https://doi.org/10.1205/cherd06040

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History

  • Received: 07 May 2024
  • Revised: 23 September 2024
  • Accepted: 25 September 2024
  • Available online: 01 January 2025

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