Motion of asymmetric bodies in two-dimensional shear flow
Motion of asymmetric bodies in two-dimensional shear flow
复制标题
二维剪切流中不对称体的运动
DOI:
10.1017/jfm.2022.203
复制
发表时间:
2022
影响因子:
3.7
通讯作者:
Stone, Howard A.
中科院分区:
文献类型:
--
作者:
Roggeveen, James V.;Stone, Howard A.
At low Reynolds numbers, axisymmetric ellipsoidal particles immersed in a shear flow undergo periodic tumbling motions known as Jeffery orbits, with the orbit determined by the initial orientation. Understanding this motion is important for predicting the overall dynamics of a suspension. While slender fibres may follow Jeffery orbits, many such particles in nature are neither straight nor rigid. Recent work exploring the dynamics of curved or elastic fibres have found Jeffery-like behaviour along with chaotic orbits, decaying orbital constants and cross-streamline drift. Most work focuses on particles with reflectional symmetry; we instead consider the behaviour of a composite asymmetric slender body made of two straight rods, suspended in a two-dimensional shear flow, to understand the effects of the shape on the dynamics. We find that for certain geometries the particle does not rotate and undergoes persistent drift across streamlines, the magnitude of which is consistent with other previously identified forms of cross-streamline drift. For this class of particles, such geometry-driven cross-streamline motion may be important in giving rise to dispersion in channel flows, thereby potentially enhancing mixing.
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期刊:
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DOI:
10.1073/pnas.2005068117
发表时间:
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影响因子:
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通讯作者:
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