固液两相流中颗粒受力及其对垂向分选的影响  

Analysis on forces acting on particles in solid-liquid two-phase flows and their effects on sediment vertical sorting

作　　者：孟晓刚[1] 倪晋仁[1] 

机构地区：[1]北京大学环境工程系

出　　处：《水利学报》2002年第9期6-13,共8页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目 (批准号 4962 5 10 1)

摘　　要：在不同颗粒浓度条件下 ,通过考虑颗粒之间的相互作用 ,对固液两相流中的颗粒受力进行了分析。采用拉格朗日方法对颗粒在一维两相流中垂向运动过程进行了模拟。根据两相流中颗粒分选达到准稳定状态时的分选特征 ,探讨了作用于颗粒的各种力对颗粒运动和分选结构的影响。The vertical motion of particles suspended in solid liquid two phase flow is simulated using 1-D Lagrangian method. Forces acting on particles are analyzed in consideration of the interaction between particles. The term expressing the interaction between particles obtained from Bagnold's experiment is added into the conventional equation of particle motion, and effects of varies forces under the conditions of different concentration are examined. The result shows that the vertical sorting patterns are primarily determined by the joint actions of inter particle force, effective gravity and resistance between phases, whereas the additional mass force and Basset force will greatly affect the sorting due to the reduction of the peak velocity of the particles.

关 键 词：固液两相流 颗粒 垂向分选 受力 

分 类 号：TV131.21[水利工程—水力学及河流动力学]