Contact angle measurement in lattice Boltzmann method

Contact angle measurement in lattice Boltzmann method
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晶格玻尔兹曼法接触角测量

DOI:
10.1016/j.camwa.2018.07.021
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发表时间:
2017-02
影响因子:
2.9
通讯作者:
Chaoying Zhang
Chaoying Zhang
中科院分区:
数学2区
文献类型:
--
作者:
Binghai Wen;Bingfang Huang;Zhangrong Qin;Chunlei Wang;Chaoying Zhang

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接触角是润湿、毛细作用和移动接触线的基本特征,然而,尽管接触角现象被有效地模拟,但在计算流体力学中,特别是在动态环境中,接触角的精确和实时测量还没有得到很好的研究。在这里,我们设计了一个基于几何的介观方案,用于在现场测量接触角的格子玻尔兹曼方法。在不考虑重力影响的情况下,测量结果与球冠法的基准值吻合较好。通过模拟光滑固体表面上的固着液滴和悬垂液滴以及化学非均匀表面上的动态接触角滞后,在重力环境中进一步验证了该方案的性能。该方案简单,计算效率高。它只需要本地数据,并且与多相模型无关。
Contact angle is an essential characteristic in wetting, capillarity and moving contact line;however, although contact angle phenomena are effectively simulated, an accurate and real-time measurement for contact angle has not been well studied in computational fluid.dynamics, especially in dynamic environments. Here, we design a geometry-based mesoscopic scheme for on-the-spot measurement of the contact angle in the lattice Boltzmann method. The measuring results without gravity effect are in good agreement with the.benchmarks from the spherical cap method. The performances of the scheme are further verified in gravitational environments by simulating sessile and pendent droplets on smooth solid surfaces and dynamic contact angle hysteresis on chemically heterogeneous surfaces. This scheme is simple and computationally efficient. It requires only the local data and is independent of multiphase models.
非理想流体的基于化学势的格子玻尔兹曼方法
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