本文利用各向同性均匀紊流理论推导了明渠剪切紊流中心区固 液两相速度差的计算公式 ,结果表明固液两相速度差依赖于颗粒密度、尺寸以及流体的平均速度和水力半径。进而研究了悬浮颗粒在紊流中的扩散系数 ,给出了紊流中的悬浮颗粒扩散系数的计算公式。该公式充分考虑了悬浮颗粒粒径、密度等颗粒特征参数以及流体粘性系数、平均流速和水力半径等水流参数对悬浮颗粒在紊流中的影响 ,能够比较全面地描述悬浮颗粒在紊流中的扩散情况。为了验证固 液两相流速度差计算公式 ,作者进行了水槽实验 ,实验结果与计算结果吻合良好 In this paper, the isotropic homogeneous turbulence theory is used to derive the formula for the velocity difference between the solid and liquid phases in the central region of the open channel shear turbulence. The results show that the velocity difference between the solid and liquid phases depends on the particle density and size, the average velocity of the fluid and the hydraulic radius . Then the diffusion coefficient of suspended particles in turbulent flow is studied, and the formula of diffusion coefficient of suspended particles in turbulent flow is given. The formula takes full account of the particle characteristics such as particle size and density of suspended particles and the influence of the flow parameters such as fluid viscosity coefficient, average flow velocity and hydraulic radius on the turbulence of the suspended particles, and can fully describe the influence of the suspended particles in the turbulent flow Diffusion. In order to verify the formula for calculating the velocity difference between solid and liquid phases, the author conducted a sink experiment and the experimental results agree well with the calculated results