Volume 69, Number 5, March 2005
|Page(s)||746 - 752|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||02 February 2005|
Control of chemo-hydrodynamic pattern formation by external localized cooling
Service de Chimie Physique and Center for Nonlinear Phenomena and Complex Systems, CP 231, Université Libre de Bruxelles - 1050 Brussels, Belgium
2 Institute for Aerospace Engeneering, Dresden University of Technology 01062 Dresden, Germany
Accepted: 3 January 2005
Chemo-hydrodynamic patterns can form in a chemical two-layer system in a Hele-Shaw cell when each fluid contains separately a reactant of an exothermic neutralization reaction. When one reactant diffuses through the interface, the coupling between the chemical reaction and buoyancy-driven flows gives rise to complex spatio-temporal fingering near the interface. We show both experimentally and theoretically that such chemistry-driven fingering and its characteristics can be precisely controlled by external cooling applied locally along the sidewalls of the reactor. This control process gives a bright example of cooperative phenomena between chemistry and hydrodynamics and offers promising technological applications.
PACS: 47.70.Fw – Chemically reactive flows / 47.70.-n – Reactive, radiative, or nonequilibrium flows / 47.20.Bp – Buoyancy-driven instability
© EDP Sciences, 2005
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