Weitz, D. A. , Stokes, J., Ball, Robin and Kushnick, A.. (1987) Dynamic capillary pressure in porous media : origin of the viscous-fingering length scale. Physical Review Letters, Vol.59 (No.26). pp. 2967-2970. ISSN 0031-9007

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Abstract

We measure the velocity dependence of the capillary pressure, ΔPc(v), between two fluids in a porous medium. At zero velocity, the interface is pinned, and a critical ΔPc must be achieved before the interface moves. For nonzero velocities, there is an additional dynamic component to ΔPc, which scales as v1/2 when a wetting fluid displaces a nonwetting fluid. We suggest that this dynamic component of ΔPc can stabilize viscous fingers, and obtain excellent agreement with experiment.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Viscosity, Viscous flow, Porous materials, Capillaries -- Permeability
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	1987
Volume:	Vol.59
Number:	No.26
Page Range:	pp. 2967-2970
Identification Number:	10.1103/PhysRevLett.59.2967
Status:	Peer Reviewed
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/39431

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