Document Type

Article

Publication Date

Winter 1-18-2012

Publication Source

Physical Review E

Volume

85

Inclusive pages

016207-1-016207-5

Publisher

American Physical Society

Peer Reviewed

yes

Abstract

Density gradients across a reaction front can lead to convective fluid motion. Stable fronts require a heavier fluid on top of a lighter one to generate convective fluid motion. On the other hand, unstable fronts can be stabilized with an opposing density gradient, where the lighter fluid is on top. In this case, we can have a stable flat front without convection or a steady convective front of a given wavelength near the onset of convection. The fronts are described with the Kuramoto-Sivashinsky equation coupled to hydrodynamics governed by Darcy’s law. We obtain a dispersion relation between growth rates and perturbation wave numbers in the presence of a density discontinuity accross the front. We also analyze the effects of this density change in the transition to chaos.

Keywords

Reaction fronts, convection, Rayleigh-Taylor instability

Disciplines

Physics

Included in

Physics Commons

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Link to Original Published Item

http://pre.aps.org/abstract/PRE/v85/i1/e016207