Drops on an arbitrarily wetting substrate: a phase field description.
Drops on an arbitrarily wetting substrate: a phase field description.
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DOI：
10.1103/physreve.78.066307
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发表时间：
2008-12
期刊：
影响因子：
--
通讯作者：
R. Borcia;I. Borcia;M. Bestehorn
中科院分区：
文献类型：
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作者：
R. Borcia;I. Borcia;M. Bestehorn
我们提出了一种用相场模型研究固体衬底上的液体薄膜的方案。对于范德华流体——远离临界——最自然的相场函数是流体密度。理论描述基于带附加相场项的Navier-Stokes方程和连续性方程。在没有界面条件的模型中，可以通过固体壁面处密度场的边界条件来控制接触角[L]。M. Pismen和Y. pomemav，物理学家。[j].地球科学进展，2004,24(2)。我们研究了液体薄膜在具有可变润湿性的扁平均匀固体载体上的稳定性。对于几乎疏水的表面，液体膜破裂，从平面膜转变为液滴。最后，我们报告了静态液滴在平面水平固体支撑上的二维数值模拟，以及重力作用下液滴在倾斜基底上滑动的二维数值模拟。
We propose a scheme for studying thin liquid films on a solid substrate using a phase field model. For a van der Waals fluid-far from criticality-the most natural phase field function is the fluid density. The theoretical description is based on the Navier-Stokes equation with extra phase field terms and the continuity equation. In this model free of interface conditions, the contact angle can be controlled through the boundary conditions for the density field at the solid walls [L. M. Pismen and Y. Pomeav, Phys. Rev. E 62, 2480 (2000)]. We investigate the stability of a thin liquid film on a flat homogeneous solid support with variable wettability. For almost hydrophobic surfaces, the liquid film breaks up and transitions from a flat film to drops occur. Finally, we report on two-dimensional numerical simulations for static liquid drops resting on a flat horizontal solid support and for drops sliding down on inclined substrates under gravity effects.