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Numerical Heat Transfer, Part A: Applications
An International Journal of Computation and Methodology
Volume 55, 2009 - Issue 10
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Original Articles

Numerical Study of Micro-Macro Coupled Transport Phenomena in the Unidirectional Solidification of a Binary System

Y. H. Feng Thermal Engineering Department, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, People's Republic of ChinaCorrespondence[email protected]
,
H. Nie Thermal Engineering Department, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, People's Republic of China
,
X. X. Zhang Thermal Engineering Department, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, People's Republic of China
&
G. Z. Zhang Thermal Engineering Department, School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, People's Republic of China
Pages 952-965 | Received 27 Sep 2007, Accepted 02 Apr 2009, Published online: 12 May 2009
 
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Abstract

A mathematical model that considers both microheat and mass transfer and macrotransport phenomena is presented to investigate the unidirectional solidification of a binary NH4Cl-H2O solution. It is shown that the solidus and liquidus locations predicted by the numerical coupling calculation are close to the experimental data. The variation of solute concentration approaches the Scheil equation. The mushy zone has good permeability and makes way for double diffusive flow. The deviation of numerical results of new phase growth from experimental data is probably caused by the inadequate estimation of permeability and microfluid flow in the mushy layer.

The authors are grateful for the support of this work by the National Natural Science Foundation of China (Project no. 50676010).

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