Computer simulation of liquid encapsulated vertical Bridgman crystal growth: Pseudo steady-state calculations

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Title:	Computer simulation of liquid encapsulated vertical Bridgman crystal growth: Pseudo steady-state calculations
Authors:	Lan,CW;Ting,CC
Contributors:	化學工程與材料工程學系
Keywords:	GRADIENT FREEZE;HEAT-TRANSFER;FLOATING-ZONE;GAAS GROWTH;FLUID-FLOW;DIRECTIONAL SOLIDIFICATION;NUMERICAL-SIMULATION;INTERFACE SHAPES;SINGLE-CRYSTAL;LINEAR-SYSTEMS
Date:	1996
Issue Date:	2010-06-29 17:31:52 (UTC+8)
Publisher:	中央大學
Abstract:	A pseudo steady-state model is developed to study heat transfer, fluid flow, and the interface shape in the liquid encapsulated vertical Bridgman crystal growth. The model, which is governed by momentum, heat, and overall mass balances in the system, is solved by a finite-volume/Newton method. Flow and temperature fields, as well as unknown melt/crystal and melt/encapsulant interfaces, are calculated simultaneously. Sample calculations are mainly conducted for the GaAs/B2O3/PBN system. Calculated results for the Germanium/graphite system are compared with finite element calculations by Adornato and Brown, and they are in good agreement. The effects of some process parameters, including the growth speed, ambient temperature profile and heat transfer conditions, on flow patterns, temperature fields and the interface shape are illustrated through calculated results. Interface inversion from concave to convex, by modifying the ambient temperature profile, is also demonstrated through computer simulation. Particularly, through an inverse problem approach, a flat interface can be easily obtained for various operation conditions.
Relation:	INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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