The Mathematical Institute, University of Oxford, Eprints Archive

Effect of disjoining in a thin film equation with non-uniform forcing

Moulton, D E and Lega, J (2013) Effect of disjoining in a thin film equation with non-uniform forcing. European Journal of Applied Mathematics, 24 (6). pp. 887-920.



We explore the effect of disjoining pressure on a thin film equation in the presence of a non-uniform body force, motivated by a model describing the reverse draining of a magnetic film. To this end, we use a combination of numerical investigations and analytical considerations. The disjoining pressure has a regularizing influence on the evolution of the system and appears to select a single steady-state solution for fixed height boundary conditions; this is in contrast with the existence of a continuum of locally attracting solutions that exist in the absence of disjoining pressure for the same boundary conditions. We numerically implement matched asymptotic expansions to construct equilibrium solutions and also investigate how they behave as the disjoining pressure is sent to zero. Finally, we consider the effect of the competition between forcing and disjoining pressure on the coarsening dynamics of the thin film for fixed contact angle boundary conditions.

Item Type:Article
Uncontrolled Keywords:evolution equation; lubrication approximation; magnetic film; matched asymptotic expansion; coarsening
Subjects:A - C > Biology and other natural sciences
Research Groups:Centre for Mathematical Biology
ID Code:1826
Deposited By: Sara Jolliffe
Deposited On:27 Mar 2014 07:49
Last Modified:29 May 2015 19:31

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