Long-time Evolution of Interfacial Structure of Partial Wetting
arXiv:2006.15936 · doi:10.1103/PhysRevFluids.5.114001
Abstract
When a solid plate is withdrawn from a partially wetting liquid, a liquid layer dewets the moving substrate.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. In addition, a new region is observed during onset which differs from the behavior predicted by previous models.
arXiv comment14 pages, 17 figures
References in corpus (5)
- Hydrodynamic theory of de-wetting
- Relaxation of a dewetting contact line Part 1: A full-scale hydrodynamic calculation
- Relaxation of a dewetting contact line Part 2: Experiments
- Characteristic interfacial structure behind a rapidly moving contact line
- Determining the refractive index, absolute thickness and local slope of a thin transparent film using multi-wavelength and multi-incident-angle interference