管壁流体滤失条件下水平圆管中平衡砂床运移模拟

Simulation of Bed Movement in Horizontal Pipeline with Wall Fluid Filtration

根据水流紊动理论和颗粒运动特征,将床层表面水流速度视为正态分布,得到床面颗粒的各运动状态慨率。根据颗粒状态概率代表运动趋势的原理,建立了圆管中砂床平衡高度的计算模型,可以用于存在管壁流体正滤失、负滤失和无滤失条件下圆管砾石充填过程中砂床形成和运移过程的可视化模拟。

According to the turbulence theory and the behavior characteristics of the grains, the instantaneous velocity of fluid around the bed surface is regarded to accord the normal distribution and the finally movement status probability of grains on the bed surface are obtained. By the principle that the status probability implicates the coming behavior tendency, the equilibrium bed height calculation model is evolved, which can be used to simulate the bed moving process visually in horizontal solid-liquid two phase flow with wall fluid plus filtration, minus filtration and no filtration to judge whether slugging would occur or not.