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arXiv 1102.2144cond-mat.soft
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平板上圆柱形液滴的动力学:格子Boltzmann模型与简单解析模型

Dynamics of cylindrical droplets on flat substrate: Lattice Boltzmann modeling versus simple analytic models

Nasrollah Moradi, Fathollah Varnik, Ingo Steinbach

摘要:

从理论和格子Boltzmann模拟两方面研究了圆柱形液滴在外力作用下的稳态运动。在保持液滴形状不变性的前提下,液滴质心速度与力密度和液滴半径的平方成线性关系。然而,随着液滴变形变得显著,出现非线性行为。这种变形与在足够高的外力下发生的液滴伸长有关。然而,独立的力密度或液滴的大小,质心速度被发现是线性的动力粘度的倒数。此外,它示出的能量主要耗散在基板附近的区域,特别是接近三相接触线。总的粘性耗散被发现是成正比的力密度的平方和动力粘度的倒数。此外,质心速度的平衡接触角的依赖关系进行了研究。提供了一个简单的分析模型再现所观察到的行为。

英文摘要:

The steady state motion of cylindrical droplets under the action of external body force is investigated both theoretically and via lattice Boltzmann simulation. As long as the shape-invariance of droplet is maintained, the droplet's center-of-mass velocity linearly scales with both the force density and the square of droplet radius. However, a non-linear behavior appears as the droplet deformation becomes significant. This deformation is associated with the drop elongation occurring at sufficiently high external forcing. Yet, independent of either the force density or the droplet size, the center-of-mass velocity is found to be linear in terms of the inverse of dynamic viscosity. In addition, it is shown that the energy is mainly dissipated in a region near the substrate particularly close to the three phase contact line. The total viscous dissipation is found to be proportional to both the square of force density and the inverse of dynamic viscosity. Moreover, the dependence of the center-of-mass velocity on the equilibrium contact angle is investigated. A simple analytic model is provided reproducing the observed behavior.

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