Fall velocity of single spheres in vertically oscillating fluids
Fall velocity of single spheres in vertically oscillating fluids
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DOI：
10.1016/0169-5983(89)90022-1
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发表时间：
1989-12
影响因子：
1.5
通讯作者：
S. Ikeda;Masashige Yamasaka
中科院分区：
文献类型：
--
作者：
S. Ikeda;Masashige Yamasaka
用非线性摄动技术分析了单个球形颗粒在垂直振荡流体中的沉降或上升速度。结果表明，在振荡流体中，粒子的迟滞主要是由阻力的非线性特性引起的，并且迟滞是由静止流体中沉降球的雷诺数、流体振动的无量纲速度幅值和流体振动的无量纲频率三个自变量决定的。结果表明，现有的理论都是本文分析的特例。用Ho数据对模型进行了验证，该模型覆盖了三个独立参数的大范围，支持了现有的理论。
The settling or rising velocity of a single spherical particle in a vertically oscillating fluid is analysed in terms of the nonlinear perturbation technique. It is demonstrated that the retardation of the particle in an oscillating fluid is caused essentially by the nonlinear nature of the drag force, and the retardation is found to be governed by three independent variables, the Reynolds number of the settling sphere in still fluid, the dimensionless velocity amplitude of the fluid oscillation and the dimensionless frequency of fluid oscillation. It is shown that the existing theories are special cases of the present analysis. The model is tested with Ho's data which cover wide ranges of the three independent parameters, and it supports the current theory.