【摘要】 采用相场模型和有限差分方法,模拟了过冷纯金属熔体的枝晶生长,计算区域为二维正方形均匀网格.建立了不同热扩散条件下尖端过冷度、速度、半径随时间变化的关系;此外研究发现枝晶稳定生长时,其尖端过冷度和速度与热扩散系数成正比,尖端半径与热扩散系数成反比.更多还原

【Abstract】 Dendrite growth has been simulated with the phase field method and finite difference schemes on a two dimensional rectangular domain with a uniform square mesh.The relationships of dendrite tip subcooling,velocity and radius with dimensionless time have been established,respectively,at several thermal diffusivity levels.It is found that the dendrite steady-state tip subcooling and velocity are roughly in proportion to thermal diffusivity,respectively,and radius is in inverse proportion to thermal diffusivity.更多还原