不同流速条件下平行平板流动腔底面剪应力分布的数值模拟与分析

Numerical Simulation of the Distribution of Shear Stress on the Bottom of Parallel Plate Flow Chamber under Different Inlet Velocity Conditions

利用计算流体力学方法对不同流速条件下平行平板流动腔核心部件内剪应力分布情况进行了数值模拟分析。通过引入相对误差概念,将求得的相对误差对0.7%的误差平面投影,对剪应力分布均匀的有效区域与实际入口长度作进一步分析。结果表明,剪应力分布均匀的有效区域随入口流速增加而增加,这种变化主要体现在长度方向上;实际入口长度远远大于理论入口长度。因此,实际流动腔设计时有必要根据所需剪应力范围、有效区域面积对流动腔作进一步优化。

The distribution of shear stress on the bottom of the parallel plate flow chamber under different inlet velocities was analyzed by numerical simulation.In the present experimental study,the projection planes of the relative errors at 0.7% level were obtained,and then the efficient region and the actual entrance length were further corrected by introducing the concept of relative error.The results showed that the efficient region of the chamber increased with the direction of length while the inlet velocity was increased,and the actual entrance length was much greater than that of the theoretical entrance length.Therefore,in accordance to the needed range of shear stress in experiment and to the needed efficient region area,the optimum design of the flow chamber is necessary.