Phys.org June 22, 2022
If the nature of the surface is such that it repels liquid, the very act of replenishing the film by spraying liquid on the surface may create vulnerable dry spots due to droplet collisions with the film. The formation of a stable dry spot has only been studied in the inviscid case. An international team of researchers (Russia, Canada) examined the break-up of viscous films, and demonstrated the importance and role of the viscous dissipation in both film and droplet. They proposed a new model to predict the necessary droplet energy to create a dry spot. It also showed that the dissipation contribution in film dominates when the ratio of the thicknesses to drop diameter is larger than 7/4…read more. Open Access TECHNICAL ARTICLE
Schematic of the film rupture experiment. Credit: Fluids 2022, 7(6), 196Â