Bulletin of the American Physical Society
65th Annual Meeting of the APS Division of Fluid Dynamics
Volume 57, Number 17
Sunday–Tuesday, November 18–20, 2012; San Diego, California
Session M9: Interfacial/Thin Film Instability VI
8:00 AM–10:10 AM,
Tuesday, November 20, 2012
Chair: Mohamed Gad-el-Hak, Virginia Commonwealth University
Abstract ID: BAPS.2012.DFD.M9.9
Abstract: M9.00009 : Fluid displacement under elastic membranes: Dynamics and interfacial instabilities*
9:44 AM–9:57 AM
Preview Abstract Abstract
(University of Manchester)
The spreading of fluids under a flexible membrane is a feature of many systems such as the lateral intrusion of magma under a terrestrial crust, or when blood spreads underneath the skin giving the signature color of bruises. In this work, we investigate the displacement of a viscous fluid by a gas underneath an elastic membrane. We consider a radial Hele-Shaw cell where the upper plate is an elastic sheet. The dynamics of the interface between the injected gas and the displaced fluid are fundamentally modified by the presence of an elastic boundary, which leads to the suppression of viscous fingering below a critical flow rate. We demonstrate theoretically the mechanism of suppression and find the corresponding critical flow rate. In addition, we study the dynamics of a stable (circular) interface propagating underneath an elastic membrane and derive the scaling laws for both the position of the interface and the shape of the elastic membrane. Our theoretical findings agree very well with the experimental results of D. Pihler-Puzovic et al. (PRL 2012).
*T. T. Al-Housseiny is supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-0646086.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.DFD.M9.9
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