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RESEARCH PAPERS: Phase Change and Multiphase Heat Transfer

The Effects of Sublimation-Condensation Region on Heat and Mass Transfer During Microwave Freeze Drying

[+] Author and Article Information
Zhao Hui Wang, Ming Heng Shi

Department of Power Engineering, Southeast University, Nanjing 210018, P. R. China

J. Heat Transfer 120(3), 654-660 (Aug 01, 1998) (7 pages) doi:10.1115/1.2824333 History: Received May 12, 1997; Revised March 25, 1998; Online December 05, 2007

Abstract

The sublimation-condensation model, developed for freeze drying of unsaturated porous media in the author’s previous work, is analyzed numerically. The moisture redistribution in the sublimation-condensation region is taken into account in this model. The calculations show that the saturation of ice in the sublimation-condensation region will obviously decrease, and its effects on heat and mass transfer cannot be neglected for microwave freeze-drying of unsaturated porous media. The microwave freeze-drying tests of unsaturated beef are carried out. The experimental results show that the drying time is approximately proportional to the initial saturation of beef. Moreover the sublimation-condensation model is validated by the experimental results. These results show that the sublimation-condensation model agrees better with experimental results than the sublimation interface model.

Copyright © 1998 by The American Society of Mechanical Engineers
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