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Long-time evolution of interfacial structure of partial wetting
Physical Review Fluids ( IF 2.7 ) Pub Date : 2020-11-09 , DOI: 10.1103/physrevfluids.5.114001
Mengfei He

When a solid plate is withdrawn from a partially wetting liquid, a liquid layer dewets the moving substrate. High-speed imaging reveals alternating thin and thick regions in the entrained layer in the transverse direction at steady state. This paper systematically compares this situation to the reversed process, forced wetting, where a solid entrains an air layer along its surface as it is pushed into a liquid. To quantify the absolute thickness of these steady-state structures precisely, I have developed an optical technique, taking advantage of the angle dependence of interference, combined with a method based on a maximum-likelihood estimation. The data show that the thicknesses of both regions of the film scale with the capillary number, Ca. Further, an additional region is observed during onset, the quantitative explanation of which requires future investigation.

中文翻译:

局部润湿界面结构的长期演化

当从部分润湿的液体中抽出固体板时,液体层会润湿移动的基材。高速成像揭示了在稳态下,夹带层在横向上交替出现的薄区域和厚区域。本文将这种情况与反向过程(强制润湿)进行了系统比较,在反向过程中,固体被推入液体时会沿其表面夹带一层空气。为了精确地量化这些稳态结构的绝对厚度,我开发了一种光学技术,利用了干涉的角度依赖性,并结合了基于最大似然估计的方法。数据表明,膜的两个区域的厚度均与毛细管数成比例,。此外,在发病期间观察到另外的区域,其定量解释需要进一步研究。
更新日期:2020-11-12
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