Convective instability of an acidity front in Hele-Shaw cells
Convective instability of an acidity front in Hele-Shaw cells
Density fingering arising in the acid-catalyzed chlorite-tetrathionate reaction is investigated experimentally in Hele-Shaw cells of various thickness. Upward propagating chemical fronts are stable for all gapwidths examined. The initial evolution of the downward propagating planar fronts resulting in a cellular structure has been characterized by dispersion curves and it is found that the convectively unstable regime increases as the gapwidth increases. From the dispersion curves, the change in the characteristics of the most unstable mode and in the marginal wave number, separating the stable and unstable modes, is determined quantitatively.
Bánsági, Tamás
3984187d-60fd-47f2-b6cb-f312dcedadae
Horváth, Dezső
9030b786-a7dd-483c-a336-5471279608ae
Tóth, Ágota
0fec3cc5-69fa-4377-9140-46a2f9c04cbb
7 August 2003
Bánsági, Tamás
3984187d-60fd-47f2-b6cb-f312dcedadae
Horváth, Dezső
9030b786-a7dd-483c-a336-5471279608ae
Tóth, Ágota
0fec3cc5-69fa-4377-9140-46a2f9c04cbb
Bánsági, Tamás, Horváth, Dezső and Tóth, Ágota
(2003)
Convective instability of an acidity front in Hele-Shaw cells.
Physical Review E.
(doi:10.1103/physreve.68.026303).
Abstract
Density fingering arising in the acid-catalyzed chlorite-tetrathionate reaction is investigated experimentally in Hele-Shaw cells of various thickness. Upward propagating chemical fronts are stable for all gapwidths examined. The initial evolution of the downward propagating planar fronts resulting in a cellular structure has been characterized by dispersion curves and it is found that the convectively unstable regime increases as the gapwidth increases. From the dispersion curves, the change in the characteristics of the most unstable mode and in the marginal wave number, separating the stable and unstable modes, is determined quantitatively.
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Published date: 7 August 2003
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Local EPrints ID: 505657
URI: http://eprints.soton.ac.uk/id/eprint/505657
ISSN: 1539-3755
PURE UUID: 1d2dd019-b8a0-4c61-ba6d-eafed4c4b2ce
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Date deposited: 15 Oct 2025 16:52
Last modified: 16 Oct 2025 02:11
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Author:
Tamás Bánsági
Author:
Dezső Horváth
Author:
Ágota Tóth
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