点击次数：
论文类型：期刊论文
发表时间：2018-05-16
发表刊物：CHEMICAL PHYSICS LETTERS
收录刊物：SCIE、EI
卷号：700
页面范围：80-87
ISSN号：0009-2614
关键字：Initial saturation; Drying time; Adsorption; Sublimation-desorption; Mass transfer
摘要：Freeze-drying of initially porous frozen material was investigated aimed at improving the process economics by reducing drying time and raising productivity. Experimental results showed that freeze-drying can be significantly enhanced by the frozen material with prebuilt porosity, and about 31% of drying time can be saved compared with the conventionally solid frozen material under the tested operating conditions. A multiphase transport model was formulated based on the local mass non-equilibrium assumption. Numerical results showed excellent agreements between measured and predicted drying curves. Analyses of saturation and temperature profiles displayed that volumetric sublimation-desorption can occur for the initially porous frozen material. (C) 2018 Elsevier B.V. All rights reserved.