Phase-field simulations of forced flow effect on dendritic growth perpendicular to flow  

相场法模拟强迫层流对流动法向枝晶的影响(英文)

作　　者：王智平[1,2] 王军伟[1] 朱昌盛[1,3] 冯力[1] 肖荣振[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建重点实验室,兰州730050 [2]甘肃省有色金属及复合材料工程研究中心,兰州730050 [3]兰州理工大学CAD中心,兰州730050

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第3期612-617,共6页中国有色金属学报（英文版）

基　　金：Project (10964004) supported by the National Natural Science Foundation of China;Project (096RJZA104) supported by the Natural Science Foundation of Gansu Province, China

摘　　要：The effect of supercooled melt forced laminar flow at low Reynolds Number on dendritic growth perpendicular to melt flow direction was investigated with the phase-field method by incorporating melt convection and thermal noise under non-isothermal condition. By taking the dendritic growth of high pure succinonitrile （SCN） supercooled melt as an example, side-branching shape difference of melts with flow and without flow was analyzed. Relationships among supercooled melt inflow velocity, deflexion angle of dendritic arm and dendritic tip growth velocity were studied. Results show that the melt inflow velocity has few effects on the dendritic tip growth velocity. A formula of relationship between the velocity of the melt in front of primary dendritic tip and the dendritic growth time was deduced, and the calculated result was in quantitative agreement with the simulation result.采用耦和流场的相场模型,考虑热扰动影响因素,模拟非等温条件下低雷诺数过冷熔体强迫层流对流动法向枝晶生长的影响。以高纯丁二腈(SCN)过冷熔体枝晶生长为例,分析熔体有流动和无流动时二次枝晶形貌差异的原因;研究过冷熔体层流速度、流动法向一次枝晶臂偏转角度和枝晶尖端生长速度之间的关系;推导枝晶尖端前沿熔体流动速度值与枝晶生长时间的理论表达式;定量对比其理论值与模拟值,结果吻合较好。

关 键 词：phase-field method laminar flow dendritic growth computer simulation SOLIDIFICATION flow velocity 

分 类 号：TG111.4[金属学及工艺—物理冶金]