Numerical simulation of thermocapillary convection in detached solidification under microgravity

Chin J Mater Res

2009, Vol. 23

Issue (4): 431-436 DOI:

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Numerical simulation of thermocapillary convection in detached solidification under microgravity

PENG Lan ; FAN Juyan; LI Yourong; ZHU Jia

College of Power Engineering; Chongqing University; Chongqing 400044

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PENG Lan FAN Juyan LI Yourong ZHU Jia. Numerical simulation of thermocapillary convection in detached solidification under microgravity. Chin J Mater Res, 2009, 23(4): 431-436.

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Abstract

In order to understand the fundamental characteristics of thermocapillary convection in the detached solidification under microgravity, the finite-difference method is used to carry on numerical simulation. The result shows that: when Ma is small, the flow of molten liquid is steady and it only exists near the free surface. And with Ma increasing, the flow is expanded toward the inner part of molten liquid gradually and the velocity of flow on the free surface increases. On the contrary, the flow is unstable when Ma exceeds the critical Ma. The physical mechanism of this unstable thermocapillary convection can be explained as: there is a hysteresis between the variety of the velocity and the variety of the resistance.

Key words: foundational discipline in materials science thermol engineering detached solidification numerical simulation, thermocapillary convection CdZnTe

Received: 27 September 2008

ZTFLH:

O782

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Supported by National Natural Science Foundation of China No.50676112 and Natural Science Foundation of Chongqing No.2007BB4180.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2009/V23/I4/431

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