Splashing on elastic membranes: The importance of early-time dynamics

• Published in: Physics of fluids (1994) 2008-08, Vol.20 (8), p.082103-082103-8
• Main Authors: Pepper, Rachel E., Courbin, Laurent, Stone, Howard A.
• Format: Article
• Language: English
• Subjects: Drops and bubbles; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Instrumentation for fluid dynamics; Nonhomogeneous flows; Physics
• ISSN: 1070-6631; 1089-7666
• DOI: 10.1063/1.2969755

We study systematically the effect of substrate compliance on the threshold for splashing of a liquid drop using an elastic membrane under variable tension. We find that the splashing behavior is strongly affected by the tension in the membrane and splashing can be suppressed by reducing this tension. The deflection of the membrane upon droplet impact is measured using a laser sheet, and the results allow us to estimate the energy absorbed by the film upon drop impact. Measurements of the velocity and acceleration of the spreading drop after impact indicate that the splashing behavior is set at very early times after, or possibly just before, impact, far before the actual splash occurs. We also provide a model for the tension dependence of the splashing threshold based on the pressure in the drop upon impact that takes into account the interplay between membrane tension and drop parameters.