Dynamic simulation of the vertical zone-melting crystal growth

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题名:	Dynamic simulation of the vertical zone-melting crystal growth
作者:	Lan,CW;Yang,DT
贡献者:	化學工程與材料工程學系
关键词:	TRAVELING HEATER METHOD;MASS-TRANSFER;FLOW;CONVECTION;SYSTEMS
日期:	1998
上传时间:	2010-06-29 17:29:31 (UTC+8)
出版者:	中央大學
摘要:	Dynamic behavior of heat transfer, fluid flow, and interfaces in the vertical zone-melting (VZM) crystal growth is studied numerically. The model, which is governed by axisymmetric unsteady-state momentum and heat transfer and interface balance in the system, is solved by a robust finite-volume method. Single crystal growth of NaNO3 in a computer-controlled transparent multizone furnace is simulated as examples. The effects of gravity levels and heater temperature are considered. Multiple steady states obtained at stationary cases are used as initial conditions to illustrate the transient response and the stability of the VZM crystal growth to the pulse and step changes in thermal environments. For unstable cases, periodically oscillatory flow and growth rate occurring at intermediate values of the Rayleigh number are observed. The upper flow cells beneath the feed front seems to be responsible to the instability, and this is consistent with the observation during crystal growth experiments. For stable cases, a steady state can be achieved smoothly, and the calculated results are in good agreement with the ones from a pseudo steady-state model. (C) 1998 Elsevier Science Ltd. All rights reserved.
關聯:	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
显示于类别:	[化學工程與材料工程研究所] 期刊論文

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