arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.1071physics.flu-dynphysics.gen-ph
收藏

化学图案化表面上的粘性流动

Viscous Flow Over a Chemically Patterned Surface

J. E. Sprittles, Y. D. Shikhmurzaev

摘要:

经典的无滑移流体动力学边界条件表明,固体润湿性的变化不应影响相邻液体的流动。然而,实验和分子动力学模拟表明情况并非如此。在本文中,我们将展示如何在一个连续的框架中使用接口形成理论开发的润湿性的变化,可以描述在固体基板上的流动。结果表明,剪切流在一个完全平坦的固体表面上被干扰的润湿性的变化,即通过改变固体基质的化学性质。该效应的大小与cos(t1)-cos(t2)成比例,其中t1和t2是液体-气体自由表面与固体表面的两个化学性质不同的部分形成的平衡接触角。

英文摘要:

The classical fluid dynamics boundary condition of no-slip suggests that variation in the wettability of a solid should not affect the flow of an adjacent liquid. However experiments and molecular dynamics simulations indicate that this is not the case. In this paper we show how flow over a solid substrate with variations of wettability can be described in a continuum framework using the interface formation theory developed earlier. Results demonstrate that a shear flow over a perfectly flat solid surface is disturbed by a change in its wettability, i.e. by a change in the chemistry of the solid substrate. The magnitude of the effect is shown to be proportional to cos(t1)-cos(t2) where t1 and t2 are the equilibrium contact angles that a liquid-gas free surface would form with the two chemically different parts of the solid surface.

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。

↑