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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

AN ANALYSIS OF A THERMALLY-INDUCED VACUUM DRYING PROCESS FOR PERMEABLE MATS

Get access (open in a dialog) DOI: 10.1615/IHTC7.2470
pages 509-514

Résumé

The process of drying an air-free permeable mat having one surface in contact with a heater and the other surface maintained at the initial mat temperature and vapor pressure is investigated. In this situation, the usual vapor removal mechanism (diffusion) is replaced by a strong bulk flow. Mats of a hygroscopic material at low initial saturation are considered, with the liquid phase assumed to be immobile.
The process is analyzed using linearized governing equations. The results, obtained by a numerical solution method, show that following a mat heatup period and a peak drying rate, a falling rate regime occurs during which an equilibrium moisture distribution is approached. Application of the results to paperboard drying is briefly discussed.