一方向凝固過程における対流抑制と結晶成長〔熱工学, 内燃機関, 動力など〕

概要

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We studied experimentally the interaction between natural convection and dendritic growth in the mushy layer during unidirectional solidification of aqueous ammonium chloride solutions cooled from below. Small amounts of hydoxyethylcellulose were added to the solution to increase its viscosity, leading to suppression of convection. Natural convection consists of salt fingers in the liquid phase and plumes in the mushy layer for a low viscosity solution, but the onset of plumes is suppressed for a high viscosity solution. The mushy layer becomes sparsely packed, and the primary and secondary arms of the dendrites grow to noticeable sizes with increasing its viscosity, which yields a low solid fraction, e.g., 1% on average in the mushy layer for a viscosity ratio of 25.5. This deduces that natural convection strongly affects the morphology of dendrites.
一般社団法人日本機械学会の論文
1998-04-25