驱动对流阵列中的各向异性扩散

Anisotropic Diffusion in Driven Convection Arrays.

作者信息

Li Yunyun, Misko Vyacheslav R, Marchesoni Fabio, Ghosh Pulak K

机构信息

Center for Phononics and Thermal Energy Science, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.

μFlow Group, Department of Chemical Engineering, Vrije Universiteit Brussel, 1050 Brussels, Belgium.

出版信息

Entropy (Basel). 2021 Mar 14;23(3):343. doi: 10.3390/e23030343.

DOI:10.3390/e23030343

PMID:33799439

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7999235/

Abstract

We numerically investigate the transport of a Brownian colloidal particle in a square array of planar counter-rotating convection rolls at high Péclet numbers. We show that an external force produces huge excess peaks of the particle's diffusion constant with a height that depends on the force orientation and intensity. In sharp contrast, the particle's mobility is isotropic and force independent. We relate such a nonlinear response of the system to the advection properties of the laminar flow in the suspension fluid.

摘要

我们通过数值方法研究了在高佩克莱数下，布朗胶体粒子在平面反向旋转对流涡旋的方形阵列中的输运情况。我们表明，外力会产生粒子扩散常数的巨大过剩峰值，其高度取决于力的方向和强度。与之形成鲜明对比的是，粒子的迁移率是各向同性的，且与力无关。我们将系统的这种非线性响应与悬浮液中层流的平流特性联系起来。