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.
参考文献
| [1] | KESTIGIAN M.;BOLLONG A.B.;DERBY J.J. .Cadmium Zinc Telluride Substrate Growth, Characterization, and Evaluation[J].Journal of Electronic Materials,1999(6):726-731. |
| [2] | 魏彦锋,方维政,张小平,杨建荣,何力.垂直Bridgman生长CdTe过程的数值模拟[J].半导体学报,2001(07):853-859. |
| [3] | Bizet L;Duffar T .Contribution to the stability analysis of the dewetted Bridgman growth under microgravity conditions[J].Crystal Research and Technology: Journal of Experimental and Industrial Crystallography,2004(6):491-500. |
| [4] | Duffar T.;Dusserre P.;Abadie J.;Boiton P. .CRUCIBLE DE-WETTING DURING BRIDGMAN GROWTH IN MICROGRAVITY .2. SMOOTH CRUCIBLES[J].Journal of Crystal Growth,1997(3/4):397-409. |
| [5] | Yazhen Wang;Liya L. Regel;William R. Wilcox .Approximate material-balance solution to the moving meniscus model of detached solidification[J].Journal of Crystal Growth,2002(3/4):546-560. |
| [6] | 刘俊成,姚光平,崔红卫,董抒华.碲锌镉垂直布里奇曼法晶体生长过程固液界面的演化[J].人工晶体学报,2003(06):555-562. |
| [7] | Fiederle M;Duffar T;Babentsov V;Benz KW;Dusserre P;Corregidor V;Dieguez E;Delaye P;Roosen G;Chevrier V .Dewetted growth of CdTe in microgravity (STS-95)[J].Crystal Research and Technology: Journal of Experimental and Industrial Crystallography,2004(6):481-490. |
| [8] | Volz MP.;Schweizer M.;Kaiser N.;Cobb SD.;Vujisic L.;Motakef S. Szofran FR. .Bridgman growth of detached GeSi crystals[J].Journal of Crystal Growth,2002(Pt.3):1844-1848. |
| [9] | Schweizer M.;Volz MP.;Cobb SD.;Vujisic L.;Motakef S.;Szoke J. Szofran FR. .Stability of detached-grown germanium single crystals[J].Journal of Crystal Growth,2002(Pt.3):2107-2111. |
| [10] | Stelian C.;Duffar T.;Santailler JL.;Nicoara I. .Influence of temperature oscillations on the interface velocity during Bridgman crystal growth[J].Journal of Crystal Growth,2002(Pt.3):1701-1706. |
| [11] | 彭岚,张全壮.分离结晶垂直Bridgman法生长CdZnTe晶体的全局数值模拟[J].人工晶体学报,2009(06):1450-1455. |
| [12] | Numerical Simulation of Thermocapillary Convection in Detached Solidification under Microgravity[J].Microgravity science and technology,2008(3/4):p.231-235. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%