Liquid Conservation and Non-local Interface Dynamics in Imbibition

Details Liquid Conservation and Non-local Interface Dynamics in Imbibition Liquid Conservation and Non-local Interface Dynamics in Imbibition

1999-07-26

arxiv.org/abs/cond-mat/9907394v1

Phys. Rev. Lett. 83, 1628 (1999)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figs, to appear in PRL

Scientific paper

10.1103/PhysRevLett.83.1628

The propagation and roughening of a liquid-gas interface moving through a disordered medium under the influence of capillary forces is considered. The system is described by a phase-field model with conserved dynamics and spatial disorder is introduced through a quenched random field. Liquid conservation leads to slowing down of the average interface position H and imposes an intrinsic correlation length \xi_\times \sim H^{1/2} on the spatial fluctuations of the interface. The interface is statistically self affine in space, with global roughness exponent \chi \simeq 1.25 and exhibits anomalous scaling.

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