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    題名: Multi-Stage Creep Effect in Consolidation of Tofu and Okara as Soft Colloids
    作者: Iritani, Eiji;Sato, Takashi;Katagiri, Nobuyuki;Hwang, Kuo-Jen
    貢獻者: 淡江大學化學工程與材料工程學系
    關鍵詞: Consolidation;Creep Effect;Tofu;Okara;Soybean Protein
    日期: 2010
    上傳時間: 2011-10-13 22:35:50 (UTC+8)
    出版者: Tokyo: The Society of Chemical Engineers
    摘要: Consolidation experiments were carried out on pre-consolidated cakes of tofu (soybean curd) and okara (soybean curd refuse), which were soft colloids, by using a compression-permeability (C-P) cell. The variations in the average consolidation ratio of the cake over time, which is a measure of the degree of consolidation, were evaluated on the basis of the data of cake thickness versus time. Both the traditional Terzaghi model and the Terzaghi–Voigt model failed to describe consolidation behaviors of tofu gel and okara cake. A new multi-stage creep model consisted of a number of Voigt elements connected in series has been developed in order to elucidate the complicated consolidation behaviors of tofu and okara. It was shown that the consolidation behaviors of tofu and okara were accurately described using the present model. The consolidation of tofu gel, which has a high water-holding ability, was slower than that of okara, and the fraction of creep consolidation, especially ternary consolidation was more pronounced in tofu than in okara. The model calculations accurately described the dependence of consolidation behavior on consolidation pressure and the type and concentration of coagulants. It was found that the adjustable fitting parameters of consolidation appearing in the model formula remained nearly unaffected by the consolidation pressure in the range investigated. The consolidation rate approached a minimum value in the case of the tofu gel with high firmness prepared with a MgCl2 concentration of 0.05 mol/l.
    關聯: Journal of Chemical Engineering of Japan 43(2), pp.140-149
    DOI: 10.1252/jcej.09we177
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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