Observation of Freezing Phenomena in Saturated Mixture

概要

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Several saturated mixtures, such as methyl orange solution, agar, glass beads, bentonite, and sand, were frozen downward using a specially designed freezing apparatus to grasp the characteristics of freezing phenomena. Exclusion of solute with advancing freezing front was observed in the methyl orange solution, while not in the column of agar. It was found from comparison of the temperature profiles which were measured in each freezing sample that macroscopic water convection did not occur during freezing in the columns of agar, clay, and sand while it occurred in the methyl orange solution.凍結現象の特徴を把握するために，メチルオレンジ溶液および水分飽和状態の寒天，ガラスビーズ，ベントナイト，砂の各試料を，試作した凍結実験装置で下向きに凍結させた。メチルオレンジ溶液では凍結前線の進行に伴い溶質の排除が観察されたが，寒天試料では溶質の排除が見られなかった。各凍結試料に対する温度分布を比較することにより，寒天，粘土および砂では凍結過程で巨視的な水分の対流が起きないが，メチルオレンジ溶液では対流が生じていることがわかった。
Faculty of Bioresources, Mie Universityの論文
1993-01-29