B_(2)O_(3)/蓝宝石熔体热毛细对流的二维数值模拟  

Two Dimensional Numerical Simulation of Thermocapillary Convection in B_(2)O_(3)/Sapphire Melt

作　　者：莫东鸣[1] 裴江红[1] MO Dong-ming;PEI Jiang-hong(School of Mechanical Engineering,Chongqing Industry Polytechnic College,Chongqing 401120,China)

机构地区：[1]重庆工业职业技术学院机械工程学院,重庆401120

出　　处：《应用能源技术》2021年第6期1-5,共5页Applied Energy Technology

基　　金：重庆市高校创新研究群体项目,重庆市基础研究与前沿探索专项项目(cstc2018cyjAX0597);重庆市教委科学技术研究项目(KJQN201803201)。

摘　　要：针对液封提拉法生长蓝宝石晶体的热毛细对流过程,通过二维数值模拟,获得了微重力条件下、上部为自由表面的环形双液池B_(2)O_(3)/蓝宝石熔体的R-Z截面的流函数、温度分布,以及监测点的速度和温度分布,揭示了流动失稳后的振荡流型。并且把B_(2)O_(3)/蓝宝石熔体的计算结果与5cSt硅油/HT-70进行了比较。结果表明:当Marangoni数超过临界值时,B_(2)O_(3)/蓝宝石熔体系统流动出现了不同的失稳流型,即热壁向冷壁处流动的热毛细对流失稳,与近冷壁处出现的Marangoni对流。Aiming at the thermocapillary convection stability of sapphire crystal grown by liquid-sealed Czochralski method,by numerical simulation,obtained the flow function and temperature distribution of R-Z cross section,as well as the velocity and temperature distribution of monitoring point of B_(2)O_(3)/sapphire melt in annular double liquid system,with upper free surface and under microgravity condition.The calculated results of B_(2)O_(3)/sapphire melt are compared with those of 5cSt silicone oil/HT-70.The calculated results of B_(2)O_(3)/sapphire melt are compared with those of 5cst silicone oil/HT-70.The results show that when Marangoni number exceeds the critical value,different instability flow patterns appear in the B_(2)O_(3)/sapphire melt system,that is,the thermal capillary convection from the hot wall to the cold wall,and the Marangoni convection near the cold wall.

关 键 词：双液层 蓝宝石晶体 液封提拉法 热毛细对流 数值模拟 

分 类 号：O647[理学—物理化学]