Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 46, Issue 23, Pages 4489-4497Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0017-9310(03)00276-X
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The present article describes the structure of plumes generated during solidification of a binary system. A transparent aqueous ammonium chloride solution is employed for super-eutectic growth in a Hele-Shaw cell. The velocities of plume convection in the melt layer and interstitial fluid flow within the mushy layer are measured by the particle tracking and dye tracing methods, respectively. Several important features are identified for each convective flow. In particular, the plume convection is found to consist of the upward flow enveloped in the downward flow, i.e., double flow structure. The downward flow enhances the solidification in the neighborhood of the exit of the channel emanating the plume, like a volcano. Interstitial fluid within the mushy layer is observed to move downward uniformly, which is induced by the plume convection. (C) 2003 Elsevier Ltd. All rights reserved.
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