非均匀流场中变速运动颗粒所受Basset力的性质及其数值计算

The properties and calculation of Basset force acting on a particle accelerating in a Non-uniform flow field

本文对固液两相流动研究中颗粒所受Ｂａｓｓｅｔ力的性质不明确性进行了深入探讨．首先导出了Ｂａｓｓｅｔ力的表达式．然后应用典型基函数试验法对其性质进行了解析，最后研究了Ｂａｓｓｅｔ力的数值计算方法，并应用于计算颗粒在二维垂直平面射流驻点附近区域的运动．

The properties of Basset force are discussed in this paper.At first,the expression of Basset force is deduced by a simple approach and its physical meaning has been pointed out. Then the properties of Basset force are studied by using typical functions which are possibly the forms of acceleration of particle related to fluid.At last,a numerical method of calculating Basset force is presented, and particle motion in 2-D vertical plane jet flow field near stagnation point is calculated.It is shown that the magnitude order of Basset force is the same as that of Stokes viscous drag.