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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Effects of temperature boundary conditions on equiaxed dendritic growth in
phase-field simulations of binary alloy
YU Yan-mei(于艳梅), YANG Gen-cang(杨根仓),
ZHAO Da-wen(赵达文), LU Yi-li(吕衣礼)

State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University,Xi′an 710072, China

Abstract:By the phase-field approach, the dendritic growth in binary alloy melt was simulated respectively using two types of temperature boundary conditions, i.e., the constant temperature boundary by which the boundary temperature was fixed at the initial temperature, and Zero-Neumann temperature boundary. The influences of the temperature boundary conditions on numerical results are investigated. How to choose appropriate temperature boundary conditions is proposed. The results show that: 1) when the computation region is limited to a changeless size, the Zero-Neumann and constant temperature boundary conditions lead to the different dendritic growth behaviors, and the Zero-Neumann condition is preferable to the constant temperature condition; 2) when the computation region is enlarged continually with the computational time according to the increasing thermal diffusion scale, the two types of temperature boundary conditions achieve the consistent tip velocities and tip radii, and they both are appropriate choices.

 

Key words:   phase-field approach; temperature boundary condition; thermal diffusion

ISSN 1672-7029
CN 43-1423/U

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