Effects of Inlet Types and Lengths on the Flow Field of Cyclone Separators

Document Type : Regular Article


1 School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China

2 School of Energy Science and Engineering, Central South University, Changsha, Hunan 410083, China

3 School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China



The effect of inlet type and length on the flow field was considered computationally for seven cyclone separators. The turbulent model was described by the Reynolds Stress Model (RSM). The air-water interface in underflow pipe and the spatial distribution of particles were tracked by the Volume of Fluid (VOF) model and Discrete Phase Model (DPM), respectively. Comparison investigations showed that inlet type and length had important impacts on flow field of cyclone. The instability flow field and back mixing phenomena were eliminated in symmetric double-inlet cyclone. The turbulent dissipation is obvious with a short inlet length. When it increased to 1.25D/2, the area and intensity of the turbulent dissipation tended to be stable. The optimum cyclone is the symmetric double-inlet with inlet length of 1.25D/2. When the particle diameter was larger than 5 μm, the complete separation could be realized.


Abdulaziz, G. A. and Q. Shamsul (2020). Effect of temperature variations on non-equilibrium and non-isothermal two-component liquid chromatography in cylindrical columns. Journal of Liquid Chromatography & Related Technologies 43(19-20), 890-912.##
Bao, L. L., Z. L. Liu and J. Liu (2017). Experimental study for the effect of the built-in cyclone configuration on the dehydration performance of the new wet-gas recycling supersonic separator. Science Technology and Engineering 17, 177-180.##
Bogodage, S. G. and A. Y. Leung (2015). CFD simulation of cyclone separators to reduce air pollution. Powder Technology 286, 488-506.##
Caliskan, M. E., I. Karagoz, A. Avci and A. Surmen (2019). An experimental investigation into the particle classification capability of a novel cyclone separator. Separation and Purification Technology 209, 908-913.##
Demir, S., A. Karadeniz and M. Aksel (2016). Effects of cylindrical and conical heights on pressure and velocity fields in cyclones. Powder Technology 295, 209-217.##
Elsayed, K. (2015). Optimization of the cyclone separator geometry for minimum pressure drop using Co-Kriging. Powder Technology 269, 409-424.##
Elsayed, K. and C. Lacor (2011). Numerical modeling of the flow field and performance in cyclones of different cone-tip diameters. Computers & Fluids 51(1), 48-59.##
Gao, Z., J. Wang, Z. Liu, Y. Wei and Y. Mao (2020). Effects of different inlet structures on the flow field of cyclone separators. Powder Technology 372, 519-531.##
Hoekstra, A. J. (2000). Gas flow field and collection efficiency of cyclone separators. Thesis. Delf University of Technology, 2000. Hoekstra, A. J.##
Hreiz, R., C. Gentric and N. Midoux (2011). Numerical investigation of swirling flow in cylindrical cyclones. Chemical Engineering Research and Design 89, 2521-2539.##
Hwang, K. J., Y. W. Hwang and H. Yoshida (2013). Design of novel hydrocyclone for improving fine particle separation using computational fluid dynamics. Chemical Engineering Science 85, 62-68.##
Kuznetsov, B. N. and M. L. Shchipko (2010). Processing of the Kansk-Achinsk Brown Coal into Synthetic Fuel. Chemistry for Sustainable Development 18, 239-251.##
Lazrag, M., D. L. Mejia-Mendez, C. Lemaitre, P. H. E. Stafford, R. Hreiz, R. Privat, A. Hannachi and D. Barth (2016). Thermodynamic and hydrodynamic study of a gas-liquid flow in a cyclone separator downstream supercritical drying. The Journal of Supercritical Fluids 118, 27-38.##
Shafique, S., M. Afzal and R. Nawaz (2020). On the attenuation of fluid–structure coupled modes in a non-planar waveguide. Mathematics and Mechanics of Solids 25(10), 108128652091144.##
Li, Z., Z. Wang and J. Shi (2020). Optimization design of the integral inertial particle separator based on response surface method. Journal of Applied Fluid Mechanics 13(1), 133-145.##
Morsi, S. and A. Alexander (1972). An investigation of particle trajectories in two-phase flow systems. Journal of Fluid Mechanics 55(2), 193-208.##
Misiulia, D., A. G. Andersson and T. S. Lundström (2015). Effects of the inlet angle on the flow pattern and pressure drop of a cyclone with helical-roof inlet. Chemical Engineering Research and Design 102, 307-321.##
Nardo, A. D., G. Calchetti and S. Stendardo (2018). Modeling and simulation of an oxygen-blown bubbling fluidized bed gasifier using the computational particle- fluid dynamics (cpfd) approach. Journal of Applied Fluid Mechanics 11(4), 825-834.##
Oh, J., S. Choi and J. Kim (2015). Numerical simulation of an internal flow field in a uniflow cyclone separator. Powder Technology 274, 135-145.##
Pan, J., Q. Shen, X. Cui, J. Wu and H. Wang (2021). Cyclones of different sizes and underflow leakage for aerosol particles separation enhancement. Journal of Cleaner Production 280, 124379.##
Prabhansu, S., Rajmistry, S. Ganguli, P. Chandra and P. K. Chatterjee (2017). Numerical Analysis of Gas-Solid Behavior in a Cyclone Separator for Circulating Fluidized Bed System. Journal of Applied Fluid Mechanics 10(4), 101167-1176.##
Prasanna, N., K. Subramanian, S. Ajay, T. Rajagopal and V. Vigneshwaran (2021). CFD study on the performance of reducing pressure drop holes in cyclone separator. Materials Today: Proceedings 43, 1960-1968.##
Rafiee, S. E. and M. M. Sadeghiazad (2016). Efficiency evaluation of vortex tube cyclone separator. Applied Thermal Engineering 114, 300-327.##
Raeymaekers, B., I. Etsion and F. E. Talke (2007). Enhancing tribological performance of the magnetic tape/guide interface by laser surface texturing. Tribology Letters 27, 89-95.##
Safikhani, H. and P. Mehrabian (2016). Numerical study of flow field in new cyclone separators, Advanced Powder Technology 27(2), 379-387.##
Song, C., B. Pei, M. Jiang, B. Wang, D. Xu and Y. Chen (2016). Numerical analysis of forces exerted on particles in cyclone separators. Powder Technology 294, 437-448.##
Song, J., Y. Wei, G. Sun and J. Chen (2017). Experimental and CFD study of particle deposition on the outer surface of vortex finder of a cyclone separator. Chemical Engineering Journal 309, 249-262.##
Su, Y., A. Zheng and B. Zhao (2011). Numerical simulation of effect of inlet configuration on square cyclone separator performance. Powder Technology 210, 293-303.##
Wang, D. (2004). Dust collector with an inbuilt cyclonic water filter. US20040139711.##
Wang, S., H. Li, R. Wang, W. Xu and Q. Sun (2019). Effect of the inlet angle on the performance of a cyclone separator using CFD-DEM. Advanced Powder Technology 30, 227-239.##
Wasilewski, M. and L. S. Brar (2019). Effect of the inlet duct angle on the performance of cyclone separators. Separation and Purification Technology 213, 19-33.##
Wilkes, J. O. (2017). Fluid Mechanics for Chemical Engineers: with Microfluidics, CFD, and COMSOL Multiphysics 5, 3rd Edition.##
Wright, H. A., B. Demirel, S. Mohedas, R. Bahman, R. Huang, D. Ferous, J. W. Taylor, D. J. Duvenhange and S. Rolfe (2013).  Protected fischer-tropsch catalyst and method of providing same to a fischer-tropsch process. US.##
Yao, Y. G., W. S. Huang and Y. X. Wu (2021). Effects of the inlet duct length on the flow field and performance of a cyclone separator with a contracted inlet duct. Powder Technology 393, 12-22.##
Volume 15, Issue 2 - Serial Number 63
March and April 2022
Pages 591-601
  • Received: 30 March 2021
  • Revised: 15 September 2021
  • Accepted: 10 October 2021
  • First Publish Date: 03 February 2022