水沙流中颗粒脉动特性

Fluctuation characteristics of particles in sediment-laden flows

作者利用固液两相流中关于颗粒运动的动理论,对恒定均匀流条件下微观的颗粒速度分布函数变化以及颗粒脉动强度的宏观特性变化进行了分析,得到了水沙流中颗粒沿纵向和垂向脉动强度变化的理论计算结果。经与水平管流中颗粒运动的实验结果比较,二者比较吻合,从而印证了理论的合理性。

The authors analyzed the microscopic velocity distribution of sediment and macroscopic characteristics of particle peculiar velocity on the conditions of homogeneous flow by employing the kinetic theory of solidliquid twophase flow. The theoretical computation results of the mean square values of the particle peculiar velocity in axis direction and vertical direction were obtained and compared with the experimental results of particle motion in horizontal pipe. The kinetic theory was proved to be reasonable.