人工晶体学报2011，Vol.40Issue(3)：556-562,7.
微重力条件下Marangoni数对分离结晶过程的影响
Effect of the Marangoni Number on the Detached Solidification under Microgravity Condition
摘要
Abstract
In order to investigate the fundamental characteristics of thermocapillary convection in the detached solidification under microgravity, the finite-difference method was used to carry on the threedimensional numerical simulation. When the top was free surface or non-slip wall, the distribution profiles of temperature and velocity of melt could be obtained with different Marangoni numbers. The results showed that: in the case of the top is free surface, when Marangoni number is small, there were two steady toroidal roll cells in the melt which flows counter caused by the gradient of surface tension in the upper and lower free surfaces. With Marangoni number increasing, the flow was expanded toward the inner part of melt gradually and the velocity of flow on the free surface increases. On the contrary, the flow was unstable when Marangoni number exceeds the critical value. Comparing with the top being solid wall, the critical Marangoni number was lower. The physical mechanism of this unstable thermocapillary convection could be explained as: there was a hysteresis between the variety of the velocity and the variety of the resistance.关键词
新型分离结晶/Marangoni数/CdZnTe晶体/热毛细对流/数值模拟Key words
detached solidification/ marangoni number/ CdZnTe crystal/ thermocapillary convection/numerical simulation分类
能源科技引用本文复制引用
彭岚,张伟,李友荣,孟海泳..微重力条件下Marangoni数对分离结晶过程的影响[J].人工晶体学报,2011,40(3):556-562,7.基金项目
国家自然科学基金(No.51076173)资助项目 （No.51076173）
