旋转磁场光磁污水处理反应器的流场模拟与分析

许多环境工程设备需要针对不同的废水情况进行设计,但是污水处理反应器中的内部流场极其复杂,单靠经验很难判断设备的工作情况和净化效果.为了研究旋转磁场光磁污水处理反应器的流场空间分布特点,采用Gambit软件建立光磁反应器的物理模型,利用Fluent软件对三维模型的流场进行数值模拟,讨论了3种转速下对内部流场的影响,并分析了不同转速下液相流的流场分布特点.结果表明,流体流速随转速增大而增大,转速为0.2 rad/s时,流体流动较弱;而转速为0.5 rad/s时,流体能充分循环流动,但流场流速偏低;虽然转速为1.0 rad/s相比转速为0.5 rad/s时的流体紊动动能大,流场分布均匀,但此时会形成旋涡.分析不同转速下的流体流场特点,可为反应器结构设计优化提供参考.

Flow field simulation and analysis of rotating magnetic photocatalytic wastewater treatment reactor

Environmental equipments should be designed for different wastewater working conditions. However, the internal flow field in a wastewater treatment reactor is extremely complex, thus it is difficult to determine the reactor working conditions and purifying effects based on designer′s experience alone. In order to study the spatial distribution characteristics of flow field in rotating magnetic photocatalytic wastewater treatment reactors, a physical model of such a reactor is built using Gambit, and a series of numerical simulations of 3-D the flow field in it are conducted by means of Fluent, the influences of rotating speed on the liquid flow field characteristics are analyzed at three kinds of speed. The results show that the fluid flow velocity increases with the speed. The fluid flow is weaker at the speed of 0.2 rad/s; even the fluid starts to circulate adequately at the speed of 0.5 rads/s, the flow velocity is still relatively low. At 1.0 rad/s rotating speed, the fluid has a higher turbulent kinetic energy and a uniform flow distribution, but there are vortices in the flow field. An analysis of the flow field characteristics at different rotating speeds cam provide a reference for optimization design of the reactor structure.