“Čerenkov” dewetting at soft interfaces
Institut Curie, UMR 168, Laboratoire Physico-Chimie
Curie 11 rue Pierre et Marie Curie, 75231 Paris cedex 05, France
Corresponding author: email@example.com
Accepted: 21 November 2001
A non-wetting liquid is pressed between a rubber cap and a solid plate. When the plate slides at a velocity U larger than a critical value , the contact is lubricated. However, if the sliding surface carries a nucleating centre (a local depression), a “dry wake” can be induced, with a well-defined wake angle , as in Čerenkov radiation. We interpret this by a competition between a dewetting velocity and an invasion velocity U. The Mach relation is obeyed. These effects are relevant to the hydroplaning of cars on wet roads.
PACS: 83.60.Uv – Wave propagation, fracture, and crack healing / 68.08.Bc – Wetting / 68.15.+e – Liquid thin films
© EDP Sciences, 2002