INFLUENCE OF SEED CRYSTAL DIMENSION ON CRYSTAL GROWTH FROM SOLUTION UNDER MICROGRAVITY

• 来源期刊: 中国物理（英文版）
• 年，卷（期）: 2000,（5）
• 页码范围: 321-324
• 页数: 4页
• 语种: 英文

摘要

The influence of the dimension of seed crystal on the characteristics of crystal growth from solution under microgravity is studied. The dimensionless average velocity of fluid Vav, the dimensionless maximum velocity of fluid Vmax, the temperature distribution index Sθ, the concentration distribution index Sφ and the dimensionless average growth rate of crystal Vcg are calculated by only taking into account the variation of the solution density caused by the temperature change, that caused by the concentration change being neglected. In certain regions of the parameter (Ra, Pr, Sc andμ) space, some scaling laws are generated: the scales of Sφ and Vcg are given by power functions ofμwith negative exponents. It is shown that the characteristics of crystal growth for small seed crystal are different from those for large seed crystal.