Fall Velocity of Particles in Oscillating Flow
Fall Velocity of Particles in Oscillating Flow
复制标题
振荡流中粒子的下落速度
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
P. Hwang
中科院分区：
文献类型：
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作者：
P. Hwang
本文介绍了研究振荡流中粒子运动的调和分析结果。推导了一个近似方程来求解零次谐波方程，该方程控制振荡流中颗粒的有效下落速度 ν s 。该方程表明，颗粒和流体之间的瞬时相对速度显着改变了颗粒上的阻力。控制 ν s 变化的三个主要因素（与静水中的终端速度相比）是终端速度雷诺数、相位滞后以及流动和粒子振荡的速度幅度。给出了无量纲方程。应用于波浪作用下的沉积物悬浮液，分析表明悬浮液应该发生增强。
The paper presents results of harmonic analysis in studying particle motion in oscillating flows. An approximate equation is derived to solve the zeroth harmonic equation, which governs the effective fall velocity ν¯s, of particles in oscillating flows. The equation reveals that the drag force on the particles is significantly modified by the instantaneous relative velocity between particles and fluids. Three major factors that govern the variation of ν¯s (as compared to the terminal velocity in still water are the terminal velocity Reynolds number, the phase lag, and the velocity amplitudes of the flow and particle oscillations. The dimensionless equation is given. Applying to the sediment suspension under wave action, the analysis suggests that an enhancement of suspension should occur.