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混合滑动面上的有效速度边界条件

Effective velocity boundary condition at a mixed slip surface

M. Sbragaglia, A. Prosperetti

摘要:

本文研究了平面边界上随机分布有自由滑移小岛的液体流动的有效速度边界条件的性质。研究发现,在特征尺寸为$a$的自由滑移区所覆盖的面积分数$β$的最低阶,出现了滑移长度为$aβ$的宏观Navier型滑移条件.这项研究的动机是最近的实验表明,气体纳米气泡可能会形成固体壁,并可能是负责液体流动的部分滑移边界条件的外观。这些结果也与利用所谓的“莲花效应”的超疏水表面有关。

英文摘要:

This paper studies the nature of the effective velocity boundary conditions for liquid flow over a plane boundary on which small free-slip islands are randomly distributed. It is found that, to lowest order in the area fraction $β$ covered by free-slip regions with characteristic size $a$, a macroscopic Navier-type slip condition emerges with a slip length of the order of $aβ$. The study is motivated by recent experiments which suggest that gas nano-bubbles may form on solid walls and may be responsible for the appearance of a partial slip boundary conditions for liquid flow. The results are also relevant for ultra-hydrophobic surfaces exploiting the so-called ``lotus effect''.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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