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Mushy-layer dynamics in micro and hyper gravity
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2012 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 24, no 10, 103305- p.Article in journal (Refereed) Published
Abstract [en]

We describe the results of experiments on mushy layers grown from aqueous ammonium chloride solution in normal, micro, and hyper gravity environments. In the fully developed chimney state, the chimney plume dynamics differ strikingly when conditions change from micro to hyper gravity. In microgravity, we find fully arrested plume motion and suppressed convection. As gravity exceeds Earth conditions, we observe a host of phenomena, ranging from arched plumes that undergo forced Rayleigh-Taylor instabilities to in-phase multiple plume oscillatory behavior. For the same initial solute concentrations and fixed boundary cooling temperatures, we find that, in runs of over two hours, the averaged effects of microgravity and hypergravity result in suppressed growth of the mushy layers, a phenomenon caused by a net enhancement of convective heat and solute transport from the liquid to the mushy layers. These behaviors are placed in the context of the theory of convecting mushy layers as studied under normal laboratory conditions.

Place, publisher, year, edition, pages
2012. Vol. 24, no 10, 103305- p.
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Physical Sciences
URN: urn:nbn:se:su:diva-83928DOI: 10.1063/1.4760256ISI: 000310595100026OAI: diva2:577838


Available from: 2012-12-17 Created: 2012-12-17 Last updated: 2012-12-17Bibliographically approved

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Wettlaufer, John S.
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Nordic Institute for Theoretical Physics (Nordita)
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