不同高径比下浮区晶体生长熔体内对流不稳定性分析  

Analysis of Convective Instability in Melt of Floating Zone Crystal Growth with Different Aspect Ratio

作　　者：王苗苗[1] 张传成 任浩 唐绪兵[1] 丁守军 邹勇 黄护林[2] WANG Miaomiao;ZHANG Chuancheng;REN Hao;TANG Xubing;DING Shoujun;ZOU Yong;HUANG Hulin(School of Microelectronics and Data Science,Anhui University of Technology,Ma’anshan 243032,China;College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]安徽工业大学微电子与数据科学学院,马鞍山243032 [2]南京航空航天大学航天学院,南京210016

出　　处：《人工晶体学报》2023年第2期220-228,共9页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51976080,52202001);安徽省科技重大专项(202203a07020002);安徽高校自然科学研究重点项目(KJ2021A0388);安徽高校研究生科学研究项目(YSJ20210361)。

摘　　要：本文通过数值模拟的方法,研究了零重力条件下半浮区液桥内熔体热毛细对流的演化规律。在液桥的高度L和温差ΔT保持不变的情况下,通过改变液桥的半径R来改变液桥的高径比(Ar=L/R)。随着高径比Ar的变化,液桥内的对流表现出不同的流动特征。在Ar=0.5时,热毛细对流处于三维稳态;在Ar=1时,流场和温度场从稳态模式向非稳态周期多频振荡模式转变,它们之间的频率关系满足倍频关系(f_(n)=nf_(1));在Ar=1.25时,监测点的速度振荡频率增大,表现为较小幅度的振荡模式,且温度振荡消失。In this paper, the evolution of thermocapillary convection in melt of half-floating zone liquid bridge under the condition of zero gravity was studied by means of numerical simulation. Under the condition that the height L of the liquid bridge and the temperature difference ΔT remain unchanged, the aspect ratio(Ar=L/R) of the liquid bridge can be changed by changing the radius R of the liquid bridge. The convection in the liquid bridge exhibits various flow characteristics with the change of the aspect ratio Ar. Thermocapillary convection is in a three-dimensional steady state when Ar=0.5. The flow field and temperature field change from the steady state mode to the unsteady periodic multi-frequency oscillation mode satisfying the frequency doubling relationship(f_(n)=nf_(1)) when Ar=1. When Ar=1.25, the velocity oscillation frequency of the monitoring point increases, showing a smaller amplitude oscillation mode, and the temperature oscillation disappears.

关 键 词：浮区法晶体生长 液桥 热毛细对流 高径比 数值模拟 熔体 

分 类 号：O363.2[理学—流体力学] O782[理学—力学]