トレーサ微粒子の非定常流への追従性に関する研究 : 第1報,振動流中における球形微粒子の低レイノルズ数域での運動の数値解析

概要

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The motion of a spherical particle in oscillatory flows is analyzed numerically. The so-called B.B.O. equation is used as the basic equation at low Reynolds numbers below 0.1. A new method of numerical analysis of the B.B.O. equation is proposed. The oscillatory flows considered here are sinusoidally time-dependent flows. The amplitude ratio of the fluid and the particle, the differences in the velocity between the fluid and the particle, and the dependence of the Basset history term on the velocity are obtained numerically. The numerical results quantify the deviation of the particle from the fluid itself. It is established that the differences in the dimensionless velocity between the fluid and the particle are much larger than the differences in the amplitude ratio of the fluid and the particle, and the Basset history term of the B.B.O. equation can be neglected at low dimensionless frequencies below 0.01.
社団法人日本機械学会の論文
1993-03-25