Structure-based interpretation of the Strouhal-Reynolds number relationship.
Structure-based interpretation of the Strouhal-Reynolds number relationship.
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DOI：
10.1103/physrevlett.94.054504
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发表时间：
2005-02
影响因子：
8.6
通讯作者：
P. Roushan;X. Wu
中科院分区：
文献类型：
--
作者：
P. Roushan;X. Wu
自世纪末以来，圆柱绕流中的尾流一直是科学家们面临的一个长期挑战。这个看似简单的现象的许多方面仍然无法解释。特别令人感兴趣的是无量纲的旋涡脱落频率（斯特劳哈尔数St）和流体中的惯性力与粘性力之比（雷诺数Re）之间的关系。我们提出了一个新的ST-Re关系的基础上观察的结构的旋涡流肥皂膜。测量结果表明，一个简单的双参数形式St=1/（A+B/Re），描述了层流涡脱落显着良好的散装流体以及二维流动的肥皂膜。
The wake in the flow past a circular cylinder has posed a long-standing challenge to scientists since the late 19th century. Many aspects of this seemingly simple phenomenon remain unexplained. Of particular interest is the relationship between the dimensionless vortex shedding frequency (the Strouhal number St) and the ratio of inertial to viscous forces in the fluid (the Reynolds number Re). We propose a new St-Re relation based on the observations of the structure of a vortex street in flowing soap films. The measurements suggest a simple two-parameter form St=1/(A+B/Re) that describes laminar vortex shedding remarkably well for bulk fluids as well as for two-dimensional flowing soap films.