Visualization of double-diffusive convection during solidification processes of a binary mixture

Title & Authors
Visualization of double-diffusive convection during solidification processes of a binary mixture
Jeong, U-Ho; Jeong, Jae-Dong; Yu, Ho-Seon; Lee, Jun-Sik;

Abstract
An experimental study has been conducted to investigate solidification of NH$\small{_{4}}$CI-H$\small{_{2}}$0 mixtures inside a vertical rectangular enclosure. Solidification process is visualized by the shadowgraph method. Emphasis is placed on the effect of solidification parameters such as the aspect ratio, cooling wall temperature and initial composition. The aspect ratio shows a dominant effect on the number and developing time of the double diffusive layers which reveals the relative strength of solutal convection to thermal convection. Similar flow pattern is observed when the concentration difference between interdendritic liquid and the pure liquid which drives solutal convection is the same regardless of the different cooling wall temperature and initial concentration.
Keywords
Solidification;Visualization;Binary Mixture;Double-Diffusive Layer;
Language
Korean
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