μ-PD法蓝宝石纤维晶体生长中传热传质的数值模拟  

Numerical Simulation of the Heat and Mass Transfer during the Process of μ-PD Sapphire Fiber Crystal Growth

作　　者：苏文佳[1,2] 左然[1] 程晓农[2] 

机构地区：[1]江苏大学能源与动力工程学院,镇江212013 [2]江苏大学材料科学与工程学院,镇江212013

出　　处：《人工晶体学报》2014年第12期3214-3218,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金青年基金(51206069);高等学校博士学科点专项科研基金(20123227120017);江苏省自然科学基金青年基金(BK2012295);江苏大学高级专业人才科研启动基金(1281130015);江苏省博士后科研资助计划(1301049C)

摘　　要：在μ-PD法纤维蓝宝石单晶生长中,利用Comsol软件数值分析了陶瓷管开裂现象、熔体对流和磁场分布。结果表明,试验中陶瓷管保温层总是在距底部0.03 m处断裂,数值模拟发现该处为温度和Von Mises应力最高点位置,验证了数值模拟的准确性;适当增大陶瓷管保温层厚度有利于降低陶瓷管温度,从而降低其开裂概率;熔体对流中Marangoni对流占主导,浮力对流可忽略;磁场分布能够满足μ-PD法蓝宝石晶体生长需求,"趋肤效应"使最高温度位于铱坩埚最上端。During the process of the μ-PD fiber sapphire growth,numerical analysis of ceramic tube crack,melt convection and magnetic field were provided by Comsol software. The results indicate that the maximum temperature and Von Mises stress are always on the position which is located at a distance of 0.03 m from the bottom of the ceramic tube,this is consistent with the position of crack of the ceramic tube. This is also a verification of numerical models. Increasing the thickness of the ceramic tube is benefit for the decreasing of maximum temperature and also the ceramic crack probability. Marangoni flow is dominant in melt convection,the buoyancy can be negligible. The magnetic field is suitable for the μ-PD process. The maximum temperature is on the top of the iridium crucible due to the skin effect.

关 键 词：μ-PD 数值模拟 晶体生长 蓝宝石 熔体对流 

分 类 号：O78[理学—晶体学]