CFD modeling of the effect of dipleg geometry on improving efficiency of a square cyclone

Document Type : Research Article


Department of Mechanical Engineering, Nour Branch, Islamic Azad University, Nour, Iran



In the present work, an effective way is introduced to improve the efficiency of a square cyclone separator. For this aim, a dipleg is attached under the square cyclone to investigate its geometry effect on the performance of square cyclone separator. A three-dimensional (3D) Computational Fluid Dynamics (CFD) simulation is done by solving the Reynolds Averaged Navier Stokes (RANS) equations with the Reynolds Stress Model (RSM) turbulence model and using the Eulerian-Lagrangian two phase method. The particle dispersion due to turbulence in the gas phase is predicted using the Discrete Random Walk (DRW) model. The CFD predicted results show that using a dipleg although produces an increase in pressure drop but it positively enhances the separation efficiency of the square cyclone. The pressure drop is increased by about 19% by using dipleg at an inlet velocity of 28 m/s. Using dipleg significantly increases the separation efficiency of square cyclone especially at higher inlet velocity. This can be more obvious when using dipleg 1 which is minimized the 50% cut size of square cyclone about 35.5%.


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