Optimization Of Hydrodynamic Vortex Separator For Removal Sand Particles In Storm Water By Computational Fluid Dynamics

With the aim to enhance the separation potency of hydrodynamic vortex separator(HDVS)for storm runoff to get rid of sand particles.The HDVS with different center-cone bottom surface angles,inner cylinder diameter,outlet diameter,and outlet position from origin axis was studied by numerical simulation methodology of computational fluid dynamics(CFD).The simulation of solid-liquid part flow within the HDVS were conducted by 3-D Eulerian-Eulerian Multiphase model with Reynolds Stress Model combined with kinetic theory of granular flow,that specially analyzed the rate contours,recess and outlet volume fraction of solid phase and particle removal efficiency.The simulation results showed that with increase of center-cone bottom surface angel,inner cylinder diameter and increase of outlet diameter,the velocity field below the inlet and surrounding part of inner cylinder has small difference at inlet velocity of 1.44 m/sec and outlet position 0.495 m.Though,the distinction of results of inner region of inner cylinder was stark and therefore the turbulence was increased in this region.To boot,some swirls occurred within the inner zone of inner cylinder that another energy waste and had negative impact on the sand particles separation.The separation efficiency of HDVS had a positive relation with the increase of center-cone bottom surface angel,increase of inner cylinder and higher outlet position from origin axis and increase of outlet diameter,inlet position increase from origin axis and decrease inlet velocity.The optimal design parameters of HDVS were obtained.The great agreement of flow rate and alter law of separation potency proves that the mentioned that Two Fluid Model(TFM)will be accustomed optimize the separation efficiency of hydrodynamic vortex separator.