Clarification of Marangoni Convection under microgravity conditions for high quality crystal growth

澄清微重力条件下的马兰戈尼对流以实现高质量晶体生长

• 批准号: 11694176
• 负责人: HIRATA Akira
• 金额: $ 4.16万
• 依托单位: Waseda University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11694176/
• 关键词: Marangoni convection; surface tension driven convection; microgravity; crystal growth; numerical simulation; melt; 微小重力環境; 熱流束; 落下塔; 残存重力; 拡散係数; Long Capillary法

Marangoni convection in the melt is investigated for improvement of the quality of the single crystal grown from a melt. The Marangoni convection in a liquid bridge was investigated the mechanism of the transition process from two-dimensional steady flow to three-dimensional periodic flow through three-dimensional steady flow with increasing of the driving force of the thermally induced surface tension difference. The comparison of the results of the drop shaft experiments and the normal-gravity experiments cleared that the super steady region that is observed under normal-gravity conditions vanished under micro-gravity conditions. The temperature frequency in a liquid bridge induced by Marangoni convection classified into following types : steady, periodically pulsating, periodically rotating, quasi-periodic, and complex. We derived the model equations for the temperature oscillation patterns. The equations agree well with the experimental results. The equation clarified the features … More of each temperature fluctuation types. The transition process of the temperature fluctuation types depends on the shape and volume of the liquid bridge and/or the gravity level.Local heat flux on the solid-liquid interface was investigated numerically through the step change of the gravity level from 1G to micro-G induced by the drop shaft. The numerical results agree well with the experimental ones. This shows the numerical analysis explains well the heat transfer phenomena in liquid bridges. The heat flux distribution on the solid-liquid interface could be explained commonly by the combination of the following non-dimensional values : the position normalized by the liquid bridge length, Marangoni number and Prandtl number. The numerical simulation clarified the effect of remain gravity on gravity convection in the melt under Long Capillary method.These results clarified the mechanisms of the Maranogni convection in the melt. Therefore they are useful for improvement of the quality of the grown crystal from a melt. Less

为了提高熔体生长单晶的质量，研究了熔体中的Marangoni对流。研究了液桥中Marangoni对流随热致表面张力差驱动力的增大，由二维定常流经三维定常流向三维周期流转变的机理。通过与正常重力实验结果的比较，发现在正常重力条件下观测到的超稳区在微重力条件下消失。Marangoni对流诱导的液桥温度频率可分为稳态、周期性脉动、周期性旋转、准周期和复数型。我们推导了温度振荡模式的模型方程。该方程与实验结果吻合较好。该方程阐明了特征 ...更多信息 每种温度波动类型。温度脉动类型的转变过程取决于液桥的形状、体积和重力水平，通过对重力水平从1G阶跃到微G阶跃变化过程中固液界面局部热流的数值模拟，研究了重力水平对温度脉动类型转变的影响。数值计算结果与实验结果相当吻合。这说明数值分析很好地解释了液桥中的传热现象。固-液界面热流密度分布可以用液桥长度归一化位置、Marangoni数和Prandtl数等无量纲参数的组合来解释。通过数值模拟，阐明了在长毛细管法下熔体中残余重力对重力对流的影响，从而阐明了熔体中Maranogni对流的机理。因此，它们可用于改善由熔体生长的晶体的质量。少

项目成果

K. Arafune, A. Kinoshita, Y. Fujiwara and A. Hirata: "Characterization of Oscillatory Marangoni Convection in Liquid Bridges"Proc. 51st International Astronautical Congress. IAF-00-J.4.02. 1-7 (2000)

K. Arafune、A. Kinoshita、Y. Fujiwara 和 A. Hirata：“液桥中振荡马兰戈尼对流的表征”Proc。

M.Sakurai, J.Leypoldt, H.C.Kuhlmann, H.T.Rath: "Instability of Thermocapillary Convection in a Rectangular Cavity under lg and micro-g conditions"Proc.2nd Pan Pacific Basin Workshop on Microgravity Sciences 2001. IF-1148. 1-7 (2001)

M.Sakurai、J.Leypoldt、H.C.Kuhlmann、H.T.Rath：“在 lg 和微 g 条件下矩形腔中热毛细管对流的不稳定性”Proc.2nd 泛太平洋盆地微重力科学研讨会 2001 年。IF-1148。

Y.Okano, S.Umemura, Y.Enomoto, Y.Hayakawa, M.Kumagawa, A.Hirata, S.Dost: "Numerical study of Marangoni convection effect on the melting of GaSb/InSb/GaSb"J.Cryst.Growth. 235(1-4). 135-139 (2002)

Y.Okano、S.Umemura、Y.Enomoto、Y.Hayakawa、M.Kumakawa、A.Hirata、S.Dost：“Marangoni 对流效应对 GaSb/InSb/GaSb 熔化的数值研究”J.Cryst.Growth

K.Kodera, A.Kinoshita, K.Arafune, Y.Nakae, A.Hirata: "Effect of Marangoni Convection on InSb Single Crystal Growth by Horizontal Bridgman Method"Proc.Material Research Society Fall Meeting 2001(掲載予定). 1-6 (2002)

K.Kodera、A.Kinoshita、K.Arafune、Y.Nakae、A.Hirata：“马兰戈尼对流对水平布里奇曼法 InSb 单晶生长的影响”Proc.材料研究学会秋季会议 2001 年（待出版）1。 - 6 (2002)

K.Arafune, A.Hirata: "Effects of residual acceleration on diffusion processes"Proc.8th International Symposium on Computational Fluid Dynamics. 1-5 (1999)

K.Arafune、A.Hirata：“残余加速度对扩散过程的影响”Proc.第八届国际计算流体动力学研讨会。