Cavitation in a lubrication flow between a moving sphere and a boundary
Cavitation in a lubrication flow between a moving sphere and a boundary
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DOI：
10.1103/physrevlett.94.124501
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发表时间：
2005-04-01
影响因子：
8.6
通讯作者：
Mullin, T
中科院分区：
文献类型：
--
作者：
Ashmore, J;del Pino, C;Mullin, T
一个重球在一个充满粘性液体的旋转的水平圆柱体中自由运动。稳定的运动基本上是斯托克斯的，球体在固定的位置旋转，球和壁之间有润滑层。流场的对称性表明，将没有力来平衡球的重量的法向分量。然而，我们表明，正常的力可以出现时，空化气泡存在。气泡尺寸作为圆柱体旋转速率的函数进行测量，并且与使用球体上的力和扭矩平衡的模型一致。
A heavy sphere is free to move inside a rotating horizontal cylinder filled with viscous liquid. The steady motion is essentially Stokesian, and the sphere rotates at a fixed location with a lubrication layer between the ball and the wall. The symmetry of the flow field suggests there will be no force to balance the normal component of the ball's weight. However, we show that a normal force can arise when a cavitation bubble is present. The bubble size was measured as a function of the cylinder rotation rate and agrees well with a model which uses the force and torque balances on the sphere.