| 微重力条件下Marangoni数对分离结晶过程的影响 |
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| 引用本文： | 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 |
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| 作者姓名： | 彭岚 张伟 李友荣 孟海泳 |
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| 作者单位： | 重庆大学低品位能源利用技术及系统教育部重点实验室,重庆,400044 |
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| 基金项目： | 国家自然科学基金(No.51076173)资助项目 |
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| 摘 要： | 为了了解微重力条件下新型分离结晶生长过程中熔体热毛细对流的基本特征,利用有限差分法进行了三维数值模拟.当熔体顶部分别为自由表面及固壁边界条件时,得到了新型分离结晶Bridgrnan生长过程中熔体热毛细对流的速度分布和温度分布.结果表明:熔体顶部为自由表面时,当Marangoni数较小时,在上自由表面和下部狭缝处自由表面的表面张力的驱动下,熔体内部产生了逆时针和顺时针两个流动方向相反的流胞,此时熔体内的流动状态为稳态;随着Marangoni数进一步的增大,流胞的流动逐渐增强并逐步向熔体内部扩展,熔体内部温度分布非线性增强,上自由表面和下部狭缝处自由表面处速度增大;当Marangoni数超过某一临界值后,流动转化为非稳态流动.当熔体顶部为固壁时,与熔体顶部为自由表面时相比,临界Marangoni数增大.流动失稳的物理机制是流速的变化和阻力的变化之间存在滞后.
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| 关 键 词： | 新型分离结晶 Marangoni数 CdZnTe晶体 热毛细对流 数值模拟, |
Effect of the Marangoni Number on the Detached Solidification under Microgravity Condition |
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| PENG Lan,ZHANG Wei,LI You-rong,MENG Hai-yong. Effect of the Marangoni Number on the Detached Solidification under Microgravity Condition[J]. Journal of Synthetic Crystals, 2011, 40(3): 556-562 |
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| Authors: | PENG Lan ZHANG Wei LI You-rong MENG Hai-yong |
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| Affiliation: | PENG Lan,ZHANG Wei,LI You-rong,MENG Hai-yong(Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education,Chongqing University,Chongqing 400044,China) |
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| 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 three-dimensional 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 toroid... |
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| Keywords: | detached solidification marangoni number CdZnTe crystal thermocapillary convection numerical simulation |
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