Heat and Mass Transfer in Beds of Particles Undergoing Sublimation Dehydration

[+] Author and Article Information
L. L. Hardin, D. F. Dyer

Department of Mechanical Engineering, Auburn University, Auburn, Ala.

J. Heat Transfer 95(4), 516-520 (Nov 01, 1973) (5 pages) doi:10.1115/1.3450099 History: Received April 24, 1972; Online August 11, 2010


A theoretical analysis as well as an experimental study of sublimation freeze-drying is reported. The theoretical and experimental results compare within 10 percent for a test case. In addition, the theoretical work confirms that drying rates increase linearly with bed thickness for particle bed drying, as reported in earlier experiments. Drying times for a slab and particle beds with the same mass and dryer surface area are compared. It is shown that the drying time for the particle bed can be reduced by more than a factor of two compared to the equivalent slab. It is also shown that the optimum way to increase the drying rate of particle beds is to increase the number of layers rather than the size of particles.

Copyright © 1973 by ASME
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