Faraday Instability in a Surface-Frozen Liquid
Abstract
Faraday surface instability measurements of the critical acceleration, a_c, and wavenumber, k_c, for standing surface waves on a tetracosanol (C_24H_50) melt exhibit abrupt changes at T_s=54degC above the bulk freezing temperature. The measured variations of a_c and k_c vs. temperature and driving frequency are accounted for quantitatively by a hydrodynamic model, revealing a change from a free-slip surface flow, generic for a free liquid surface (T>T_s), to a surface-pinned, no-slip flow, characteristic of a flow near a wetted solid wall (T < T_s). The change at T_s is traced to the onset of surface freezing, where the steep velocity gradient in the surface-pinned flow significantly increases the viscous dissipation near the surface.
Cite
@article{arxiv.physics/0504056,
title = {Faraday Instability in a Surface-Frozen Liquid},
author = {Patrick Huber and Viktor Soprunyuk and Jan Embs and Christian Wagner and Moshe Deutsch and Satish Kumar},
journal= {arXiv preprint arXiv:physics/0504056},
year = {2009}
}
Comments
4 pages, 3 figures. Physical Review Letters (in press)