Impact Analysis of Flow Rate and Inclination Angle on Two-Phase Flow of Water and Sand in a Fish Gill-Type Sedimentation Tank
To improve the sand removal efficiency of the sedimentation tank,a novel sand removal measure has been proposed,namely the fish gill-type sedimentation tank.The fish gill-type sedimentation tank is equipped with multiple sets of tilted filter screens inside the tank room,which intercept sediment using filter screens and improve sediment set-tling efficiency.Physical model tests and numerical calculation methods were used to analyze the flow field distribution and sand removal effect under different flow rates and filter screen angles so as to obtain an optimal structural design,which provide theoretical references for engineering design and technology promotion for this type of sedimentation tank.The results show that the sediment removal rate of the sedimentation tank increased by 12.5 to 22.0%after the fish gill device was implanted.Numerical modeling further reveals that the flow rate change in the fish gill-type sedimentation tank was divided into five regions,and sediment concentration changes showed four different stages along the way.In sediment deposition calculations,the maximum sediment deposition zone appeared at the bottom of the first and second filter screens.Thus,it suggests that the mesh size of the filter screens in the front of the fish gill device should be in-creased for more reasonable placement.
fish gill-type sedimentation tankphysical test and numerical simulationflowfilter angleflow field
万方数据
维普
