Three-dimensional convection and solute segregation in vertical Bridgman crystal growth

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Title:	Three-dimensional convection and solute segregation in vertical Bridgman crystal growth
Authors:	Liang,MC;Lan,CW
Contributors:	化學工程與材料工程學系
Keywords:	DIRECTIONAL SOLIDIFICATION;NUMERICAL-SIMULATION;LINEAR-SYSTEMS;LARGE DIAMETER;BINARY-ALLOYS;HEAT-TRANSFER;DENSITY;FURNACE
Date:	1996
Issue Date:	2010-06-29 17:32:37 (UTC+8)
Publisher:	中央大學
Abstract:	Perfect axisymmetry is difficult to achieve in the vertical Bridgman crystal growth. Nonaxisymmetry is, to a certain degree, always present in a real crystal growth configuration. To study how fluid flow and solute fields in the process are affected by slight deviations from axisymmetry, a three-dimensional finite-volume/Newton method is developed. Pseudo-steady-state heat and mass transfer, fluid flow, and the growth front are solved simultaneously. The calculated results for axisymmetric cases are compared with those by two-dimensional finite volume and finite element methods, and they are in excellent agreement. Calculated results also show that three-dimensional flow and solute fields are easily induced by imperfect axisymmetry. A slightly tilted ampoule or a small temperature gradient in the azimuthal direction could break axisymmetry and dramatically affect flow patterns and solute segregation.
Relation:	JOURNAL OF CRYSTAL GROWTH
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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