Periodic heterogeneity-driven resonance amplification in density fingering

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Abstract

Periodic heterogeneity is introduced in experiments with thin solution layers where downward propagating planar autocatalytic fronts are hydrodynamically unstable and cellular patterns develop. The evolution of fingers is greatly affected by the spatial heterogeneity when the wave number associated with it falls in the vicinity of the most unstable mode of the reference system with uniform thickness. The imposed heterogeneity will drive the instability by amplifying the modes with the matching wave numbers as indicated by the experimentally constructed dispersion curves.

Original languageEnglish
Article number194501
JournalPhysical review letters
Volume97
Issue number19
DOIs
Publication statusPublished - Nov 13 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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