| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Improved contact angle measurement in multiphase lattice Boltzmann |
| Xing-Guo Zhong(钟兴国), Yang-Sha Liu(刘阳莎), Yi-Chen Yao(姚怡辰), Bing He(何冰)†, and Bing-Hai Wen(闻炳海)‡ |
| College of Computer Science and Engineering, Guangxi Normal University, Guilin 541004, China |
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Abstract Contact angle is an essential parameter to characterize substrate wettability. The measurement of contact angle in experiment and simulation is a complex and time-consuming task. In this paper, an improved method of measuring contact angle in multiphase lattice Boltzmann simulations is proposed, which can accurately obtain the real-time contact angle at a low temperature and larger density ratio. The three-phase contact point is determined by an extrapolation, and its position is not affected by the local deformation of flow field in the three-phase contact region. A series of simulations confirms that the present method has high accuracy and gird-independence. The contact angle keeps an excellent linear relationship with the chemical potential of the surface, so that it is very convenient to specify the wettability of a surface. The real-time contact angle measurement enables us to obtain the dynamic contact angle hysteresis on chemically heterogeneous surface, while the mechanical analyses can be effectively implemented at the moving contact line.
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Received: 04 August 2022
Revised: 10 October 2022
Accepted manuscript online: 21 October 2022
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PACS:
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47.11.-j
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(Computational methods in fluid dynamics)
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05.50.+q
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(Lattice theory and statistics)
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47.61.Jd
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(Multiphase flows)
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47.55.np
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(Contact lines)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12272100, 81860635, and 12062005). |
Corresponding Authors:
Bing He, Bing-Hai Wen
E-mail: hebing@gxnu.edu.cn;oceanwen@gxnu.edu.cn
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Cite this article:
Xing-Guo Zhong(钟兴国), Yang-Sha Liu(刘阳莎), Yi-Chen Yao(姚怡辰), Bing He(何冰), and Bing-Hai Wen(闻炳海) Improved contact angle measurement in multiphase lattice Boltzmann 2023 Chin. Phys. B 32 054701
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