Low Reynolds-number moment on asymmetric bodies

被引：4
|
作者：
Lund, KO [1 ]
Trees, D [1 ]
机构：
[1] Univ Calif San Diego, Energy Res Ctr, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA
来源：
EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2001年 / 24卷 / 1-2期
关键词：
external flow; asymmetric bodies; low Reynolds number; fluid moment; torque; moment coefficient; fluid drag; torsion balance; suspended particles; oscillation; nano-scale torque;
D O I：
10.1016/S0894-1777(00)00058-3
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The moment induced on asymmetric particles by a low Reynolds-number flow is examined. A flat disk and a half sphere are suspended in low-velocity airflow and the moment exerted on the particles is measured as a function of Reynolds number and approach angle. Object Reynolds-numbers range between 20 and 200, and the measured moment is in the nNm range. A moment coefficient (a moment normalized with the drag force and object radius) is calculated from the moment measurements and found to generally decrease with increasing Reynolds number. Stable approach angle positions are identified for the objects in the flow, and it is shown that the objects tend to rotate towards the position of maximum drag (local extremum) from other approach angles. The present measurements are consistent with previous qualitative observations of free-falling particles. (C) 2001 Elsevier Science Inc. All rights reserved.
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页码：61 / 66
页数：6
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