A lattice Boltzmann study on dendritic growth of a binary alloy in the presence of melt convection

被引：12

作者：

Sun, Dongke ^{[1
]}

Wang, Yong ^{[2
]}

Yu, Hongyao ^{[3
]}

Han, Qingyou ^{[4
]}

机构：

[1] Southeast Univ, Sch Mech Engn, Jiangsu Key Lab Design & Manufacture Micronano Bi, Nanjing 211189, Jiangsu, Peoples R China

[2] Max Planck Inst Dynam & Self Org, D-37077 Gottingen, Germany

[3] Cent Iron & Steel Res Inst, Beijing Key Lab Adv High Temp Mat, Beijing 100081, Peoples R China

[4] Purdue Univ, Sch Mech Engn, Dept Math, W Lafayette, IN 47907 USA

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2018年 / 123卷

基金：

中国国家自然科学基金;

关键词：

Lattice Boltzmann; Dendritic growth; Numerical simulation; Melt convection; Solidification entropy; PHASE-CHANGE; SOLIDIFICATION; MODEL; SIMULATION; FLUID; FLOW;

D O I：

10.1016/j.ijheatmasstransfer.2018.02.053

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A multi-relaxation-time (MRT) lattice Boltzmann (LB) based model is utilized to simulate the dendritic growth with melt convection in solidification of alloys. It models melt convection by the MRT-LB equation and solute transport by a conservation equation with a pseudo-potential function. The D2Q9 lattice vectors are proposed to describe interface advancement in the liquid-solid transition. Effects of undercoolings, interface curvature and preferred growth orientation are incorporated into the model implicitly. After model validation, dendritic growth under several conditions of pure diffusion and melt convection was numerically investigated, and the solidification entropies were proposed to quantitatively characterize the solidification system. The result shows that the growth behavior, microstructure formation and solute segregation are significantly influenced by melt convection. The solidification entropies reflecting complexity of the solidification system are useful to characterize dendritic growth and solute segregation. This work offers a potential solution for studies of microstructure evolution in solidification of alloys. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：213 / 226

页数：14

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