Surfing the capillary wave: Wetting dynamics beneath an impacting drop

John M. Kolinski*, Ramin Kaviani, Dylan Hade, Shmuel M. Rubinstein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The initiation of contact between liquid and a dry solid is of great fundamental and practical importance. We experimentally probe the dynamics of wetting that occur when an impacting drop first contacts a dry surface. We show that, initially, wetting is mediated by the formation and growth of nanoscale liquid bridges, binding the liquid to the solid across a thin film of air. As the liquid bridge expands, air accumulates and deforms the liquid-air interface, and a capillary wave forms ahead of the advancing wetting front. This capillary wave regularizes the pressure at the advancing wetting front and explains the anomalously low wetting velocities observed. As the liquid viscosity increases, the wetting front velocity decreases; we propose a phenomenological scaling for the observed decrease of the wetting velocity with liquid viscosity.

Original languageAmerican English
Article number123605
JournalPhysical Review Fluids
Volume4
Issue number12
DOIs
StatePublished - 24 Dec 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 American Physical Society.

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