Basset力对颗粒运动的影响

Effects of Basset History Force on the Motion in a Flow Field

简要描述了Ｂａｓｓｅｔ力的产生，着重分析和讨论了Ｂａｓｓｅｔ力对场中运动颗粒的影响，给出了Ｂａｓｓｅｔ力随颗粒直径及颗粒与流体密度比变化的关系。

Using the spectral method from the Lagrangian particle motion equation, the particle motion statistice in solid--liquid turbulent flows by including the pqrticle pqrticle Lagrangian energy spectrum, autocorrelation function and turbulent diffusivity are analzed. Effects of the Basset term on these statistice mainly are presented. It is found that the Basset force may be neglected in the Lagrangian equation of patrticle patrticle motion olny when a dimensionless number ω/a is very small and the pqrticle diameter, in general, is less than 0. 1mm.The numerics results the examine the fact is that the particle diffusivity may be exceed the fluid diffusiviety for significant period of long--time.