We focus on a formation process of a quite thin liquid film, known as ‘precursor film,’ ahead a droplet spreading on a smooth solid substrate. The spreading droplet on the solid substrate is accompanied with a movement of a visible boundary line so-called ‘macroscopic contact line.’ Existing studies have indicated there exist two major regions of the precursor film, that is, a region dominated by the fluid dynamics, and a region dominated by the molecular diffusion. Our group has dedicated our special effort to detect the formation process of the precursor film by applying a convectional laser interferometry and a high-speed camera, and to evaluate the spreading rate of the precursor film. In the present study, the existing length of the precursor film at a very early stage of the droplet spreading is evaluated by applying a Brewster-angle microscopy as well as the interferometer. We extend our attention to the advancing process of the precursor film on inclined substrate.
- Heat Transfer Division
Precursor Film Formation of Spreading Droplet
Ueno, I, Hirose, K, & Kizaki, Y. "Precursor Film Formation of Spreading Droplet." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 3. Washington, DC, USA. August 8–13, 2010. pp. 823-826. ASME. https://doi.org/10.1115/IHTC14-22635
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