3420 飽和溶融帯移動法における二次元性低減に関する検討(S89-1 微小重力・宇宙環境利用(1),S89 微小重力・宇宙環境利用)

概要

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A one-dimensional theoretical model of the traveling liquidus-zone (TLZ) method gives a precise prediction of a growth rate. However, the one-dimensionality may be worse as a sample diameter increases. To investigate limit of one-dimensional approximation, a two-dimensional theoretical model of the TLZ method is introduced. By comparing the one-dimensional model and the two-dimensional one, two-dimensionality is defined. To calculate the two-dimensionality, numerical simulation is carried out. From the calculation result of the two-dimensionality in cases of various sample diameters, it is found that microgravity condition reduces the two-dimensionality since thermal convection is suppressed. However, the two-dimensionality is not negligibly small in the larger sample diameters. The reason of the residual two-dimensionality under the microgravity condition is investigated. From the numerical simulation, it is concluded that the residual two-dimensionality is caused by thermal conduction.
社団法人日本機械学会の論文
2005-09-18