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

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

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

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