散热参数对冷心放肩微量提拉法生长蓝宝石晶体影响的数值模拟

利用数值模拟分析的方法,研究了冷心放肩微量提拉法生长蓝宝石晶体过程中热交换器散热参数对晶体质量的影响趋势;分析了热交换器的散热参数变化对晶体生长的固液界面凸出率和晶体内温度分布、温度梯度的影响.结果表明,热交换器的对流换热系数和工作流体的温度变化对晶体生长的固液界面突出率和温度梯度具有相似的影响效果;且在晶体长到一定尺寸后,只靠加大热交换器的散热热能力,不足使晶体继续生长.

Numerical Simulation of Heat Dissipation Parameters' Effect on Sapphire Crystal Growth with SAPMAC Method

Numerical analysis was used to simulate the sapphire crystal growth process with SAPMAC method. The influences of the heat dissipation parameters on the convexity of the solid-melt interface were analyzed. Temperature distribution and gradient of crystal inside are studied. The results show that thermal convection coefficient of thermal exchanger and temperature change of cooling medium have similar effects on the convexity of solid-liquid interface and temperature gradient. Also, it is concluded that it isn't sufficient for crystal continual growth if only the extraction heat capacity of heat exchanger is enlarged when the crystal grows to a certain size.