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arXiv 2101.03322physics.flu-dyn
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惯性微流控中一种未被认识的作用力

An unrecognized force in inertial microfluidics

Siddhansh Agarwal, Fan Kiat Chan, Mattia Gazzola, Sascha Hilgenfeldt

AI总结:

本文从理论与计算上揭示振荡流中存在由颗粒惯性和空间流动变化共同引起的未被认识的作用力,并通过推广Maxey-Riley理论实现定量预测。

摘要:

描述有限但不可忽略的惯性对悬浮颗粒的影响是一个基本的流体动力学问题,至今尚未在完全一般性的意义上得到解决。现代微流控通过使用高频振荡流,将这一学术问题转化为实际挑战。高频振荡流或许是在低雷诺数下利用惯性效应来精确操控颗粒、细胞和囊泡的最有效方式,且无需借助电荷或化学手段。迄今为止,关于颗粒所受流动作用力的理论理解,主要依赖于近40年前Maxey和Riley(以下简称MR)的开创性工作。我们在本文中从理论和计算两方面证明:振荡流会产生此前未被解释的、显著且持续的作用力;这些作用力来源于颗粒惯性与空间流动变化的共同作用;并且可以通过对MR理论的推广进行定量预测。

英文摘要:

Describing effects of small but finite inertia on suspended particles is a fundamental fluid dynamical problem that has never been solved in full generality. Modern microfluidics has turned this academic problem into a practical challenge through the use of high-frequency oscillatory flows, perhaps the most efficient way to take advantage of inertial effects at low Reynolds numbers, to precisely manipulate particles, cells and vesicles without the need for charges or chemistry. The theoretical understanding of flow forces on particles has so far hinged on the pioneering work of Maxey and Riley (MR in the following), almost 40 years ago. We demonstrate here theoretically and computationally that oscillatory flows exert previously unexplained, significant and persistent forces, that these emerge from a combination of particle inertia and spatial flow variation, and that they can be quantitatively predicted through a generalization of MR.

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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