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INTEGRAL TECHNIQUES APPLIED TO SUBLIMATION DRYING WITH RADIATION BOUNDARY CONDITION
Author(s) -
McCULLOCH JOHN W.,
SUNDERLAND J. EDWARD
Publication year - 1970
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1970.tb02006.x
Subject(s) - sublimation (psychology) , slab , materials science , mechanics , boundary value problem , porosity , thermodynamics , radiation , composite material , analytical chemistry (journal) , optics , chemistry , mathematics , chromatography , physics , mathematical analysis , psychology , geophysics , psychotherapist
SUMMARY– An analytical solution is presented for the temperature distribution in a semi‐infinite slab with a radiation boundary condition and sublimating phase front. 2 cases are considered. First, a solution is presented for the transient surface temperature holding the heater temperature constant. Secondly, a solution is presented for the heater temperature variation required to hold the surface at the same prescribed value reached in the first case. The application of this technique to sublimation drying is considered, along with calculations to demonstrate the effect of various parameters on the drying time. For example, a steak 1/2‐in. thick with a porosity of 0.8 can be dried 35% faster if the initial heater temperature is 200 rather than 150°F. In contrast, for the same sample, the drying time is increased by only 15.5% if the initial heater temperature is 250 instead of 200°F. Graphs are included to show how optimum drying rates may be obtained.