Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores

查看全文 作　　者：Wei [1]Wang;Dapeng [1]Hu;Yanqiu [2]Pan;Guohua [3]Chen

机构地区：[1]Department of Chemical Machinery, Dalian University of Technology;[2]Department of Chemical Engineering, Dalian University of Technology;[3]Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology

出　　处：《Chinese Journal of Chemical Engineering》索引2016年第24卷第1期,共10页

基　　金：Supported by the Fundamental Research Funds for the Central Universities(DUT14RC(3)008);the National Natural Science Foundation of China(21076042);the Research Grants Council of Hong Kong SAR(HKUST600704) 摘　　要：Freeze-drying of the initially porous frozen material with pre-built pores from liquid material was found experimentally to save drying time by over 30% with an initial saturation being 0.28 compared with the conventional operation with the initial saturation being 1, using mannitol as the solid material. In order to understand the mass and heat transfer phenomena of this novel process, a two-dimensional mathematical model of coupled mass and heat transfer was derived with reference to the cylindrical coordinate system. Three adsorption–desorption equilibrium relationships between the vapour pressure and saturation value namely, power-law, Redhead's style and Kelvin's style equation, were tested. Kelvin's style in exponential form of adsorption equilibrium relation gave an excellent agreement between the model prediction and experimental measurement when the equation parameter, γ, of 5000 was applied. Analyses of temperature and ice saturation profiles show that additional heat needs to be supplied to increase the sample temperature in order to promote the desorption process. Simulation also shows that there is a threshold initial porosity after which the drying time decreased with the increase in the initial porosity. Enhanced freeze-drying is expected to be achieved by simultaneously enhancing mass and heat transfer of the process. 关键词：冷冻干燥数值研究冻结水饱和度分布初始孔隙率吸附解吸液体材料平衡关系

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Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores

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