Orientation of non-spherical particles in an axisymmetric random flow
Orientation of non-spherical particles in an axisymmetric random flow
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DOI：
10.1017/jfm.2013.8
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发表时间：
2013-03-01
影响因子：
3.7
通讯作者：
Vincenzi, Dario
中科院分区：
文献类型：
--
作者：
Vincenzi, Dario
研究了轴对称随机流中非球形刚性颗粒的动力学问题.粒子的运动由Jeffery方程描述;随机流是高斯流，具有短的相关时间。精确地计算了各方向的稳态概率密度函数。四个制度被确定取决于流量的统计各向异性和颗粒的几何形状。如果λ是流动的对称轴，则这四种状态是：绕λ旋转，λ和-λ之间的翻滚运动，旋转和翻滚的组合，以及与λ倾斜的方向的优先对准。
The dynamics of non- spherical rigid particles immersed in an axisymmetric random flow is studied analytically. The motion of the particles is described by Jeffery's equation; the random flow is Gaussian and has short correlation time. The stationary probability density function of orientations is calculated exactly. Four regimes are identified depending on the statistical anisotropy of the flow and on the geometrical shape of the particle. If lambda is the axis of symmetry of the flow, the four regimes are: rotation about lambda, tumbling motion between lambda and -lambda, combination of rotation and tumbling, and preferential alignment with a direction oblique to lambda.