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首页> 外文期刊>Journal of Crystal Growth >Effect of solid-liquid density change on dendrite tip velocity and shape selection
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Effect of solid-liquid density change on dendrite tip velocity and shape selection

机译:固液密度变化对枝晶尖端速度和形状选择的影响

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摘要

Phase-field simulations are used to examine tip velocity and shape selection in free dendritic growth of a pure substance into an undercooled melt in the presence of a density change between the solid and liquid. The dendrite is assumed to grow two-dimensionally inside a Hele-Shaw cell. The phase-field model is coupled with a previously developed two-phase diffuse interface model to simulate the flow in the liquid that is induced by the density change. The predicted dependence of the dendrite tip growth Peclet number on the relative density change is compared with an available analytical solution and good agreement is obtained. The simulations verify that the dendrite tip selection parameter, modified to account for the different densities of the solid and liquid phases, is independent of the relative density change.
机译:相场模拟用于检查在固体和液体之间存在密度变化的情况下,纯物质自由树枝状生长到过冷熔体中的尖端速度和形状选择。假定枝晶在Hele-Shaw单元内二维生长。相场模型与先前开发的两相扩散界面模型耦合,以模拟由密度变化引起的液体中的流动。将树突尖端生长Peclet数对相对密度变化的预测依赖性与可用的分析解决方案进行比较,并获得良好的一致性。仿真结果表明,修改后的枝晶尖端选择参数可考虑固相和液相的不同密度,并且与相对密度变化无关。

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