不同密度流体场中稀疏颗粒运动的数值分析  

Numerical analysis on sparse solid particles' motion in flow fields of different density

作　　者：王子云[1,2] 龙恩深[1] 欧阳金龙[1] 王勇[3] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]中铁二院工程集团有限责任公司,四川成都610031 [3]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《重庆大学学报（自然科学版）》2010年第11期124-128,133,共6页Journal of Chongqing University

基　　金：国家十一五科技支撑计划项目(2006BAJ01A06-3)

摘　　要：推导了流体场中稀疏固体颗粒运动微分方程的三维数值解法。并以固体颗粒的自由沉降为例,采用无量纲微分方程,数值分析了固体颗粒在水中和在空气中的运动规律,重点探讨了Basset力在不同密度流体场中的贡献,结果表明颗粒在水中运动时,Basset力和曳力在同一数量级;而颗粒在空气中运动时,可以忽略Basset力的作用,在研究江水源热泵时,分析泥沙在水中的流动,需要考虑Basset力的作用。The three dimensional numerical solution for differential equation of motion of sparse solid particles in flow fields is derived.Taking free sedimentation of solid particles as an example,using dimensionless differential equation,the movement rule of solid particles in water and air is numerically analyzed.The contribution of Basset force on solid particles in different density flow fields is paid much attention to.The results show that the Basset force and drag force are in the same magnitude when solid particles move in water;the effect of Basset force can be neglected when solid particles move in the air;and the Basset force should be considered when river water source heat pump and the flow of silt particles are studied.

关 键 词：流场 微分方程 固体颗粒 Basset力 沉降 数值分析 

分 类 号：O359[理学—流体力学]