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Dissipation in rapid dynamic wetting

Published online by Cambridge University Press:  24 June 2011

A. CARLSON ,
M. DO-QUANG  and
G. AMBERG
A. CARLSON*
Affiliation:
Linné Flow Center, Department of Mechanics, The Royal Institute of Technology, SE-100 44, Stockholm, Sweden
M. DO-QUANG
Affiliation:
Linné Flow Center, Department of Mechanics, The Royal Institute of Technology, SE-100 44, Stockholm, Sweden
G. AMBERG
Affiliation:
Linné Flow Center, Department of Mechanics, The Royal Institute of Technology, SE-100 44, Stockholm, Sweden
*
†Email address for correspondence: [email protected]
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Abstract

In this article, we present a modelling approach for rapid dynamic wetting based on the phase field theory. We show that in order to model this accurately, it is important to allow for a non-equilibrium wetting boundary condition. Using a condition of this type, we obtain a direct match with experimental results reported in the literature for rapid spreading of liquid droplets on dry surfaces. By extracting the dissipation of energy and the rate of change of kinetic energy in the flow simulation, we identify a new wetting regime during the rapid phase of spreading. This is characterized by the main dissipation to be due to a re-organization of molecules at the contact line, in a diffusive or active process. This regime serves as an addition to the other wetting regimes that have previously been reported in the literature.

JFM classification

Interfacial Flows (free surface): Contact lines Drops and Bubbles: Drops Interfacial Flows (free surface): Interfacial Flows (free surface)
Type
Papers
Information
Journal of Fluid Mechanics , Volume 682 , 10 September 2011 , pp. 213 - 240
Copyright
Copyright © Cambridge University Press 2011

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Footnotes

‡

Present address: Osquars Backe 18, SE-100 44 Stockholm, Sweden.

References

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