SHEAR-FLOW NEAR SOLIDS - EPITAXIAL ORDER AND FLOW BOUNDARY-CONDITIONS
SHEAR-FLOW NEAR SOLIDS - EPITAXIAL ORDER AND FLOW BOUNDARY-CONDITIONS
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DOI：
10.1103/physreva.41.6830
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发表时间：
1990-06-15
影响因子：
2.9
通讯作者：
ROBBINS, MO
中科院分区：
文献类型：
--
作者：
THOMPSON, PA;ROBBINS, MO
我们报告的分子动力学模拟的Lennard-Jones液体之间剪切两个固体壁。针对不同的壁面和流体特性，研究了速度场、流动边界条件和流体结构。广泛的边界条件进行了观察，包括滑移，无滑移，锁定。我们表明，滑移的程度是直接相关的流体中诱导的固体壁的周期性电位的结构量。对于弱的壁面流体相互作用，几乎没有秩序和滑移观察。在大的相互作用，大量的外延有序诱导和第一个或两个流体层成为锁定的墙壁。当壁和流体密度相等时，这种外延有序性得到增强。对于不相等的密度，在第一流体层中形成高阶相称结构，从而在流体内产生滑移。
We report on molecular-dynamics simulations of Lennard-Jones liquids sheared between two solid walls. The velocity fields, flow boundary conditions, and fluid structure were studied for a variety of wall and fluid properties. A broad spectrum of boundary conditions was observed including slip, no-slip, and locking. We show that the degree of slip is directly related to the amount of structure induced in the fluid by the periodic potential from the solid walls. For weak wall-fluid interactions there is little ordering and slip was observed. At large interactions, substantial epitaxial ordering was induced and the first one or two fluid layers became locked to the wall. This epitaxial ordering was enhanced when the wall and fluid densities were equal. For unequal densities, high-order commensurate structures formed in the first fluid layer creating slip within the fluid.