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Effect on Retortable Pouch Heat Transfer Coefficients of Different Thermal Processing Stages and Pouch Material
Author(s) -
LEBOWITZ SAMUEL F.,
BHOWMIK SANTI R.
Publication year - 1990
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.1365-2621.1990.tb03949.x
Subject(s) - heat transfer , materials science , pouch , thermal , aluminum foil , foil method , thermodynamics , composite material , process (computing) , constant (computer programming) , mechanics , chemistry , computer science , physics , surgery , medicine , layer (electronics) , programming language , operating system
Apparent heat transfer coefficients (h) were determined for the come‐up, heating, and cooling cycles of thermal processing for retortable pouches heated by circulating hot water under overriding air pressure. Values for h were converged on by a computer‐based optimization method that incorporated process data, a finite difference model, and optimization criteria. For retortable pouches thermally processed in circulating water under overriding air pressure, h values for the come‐up, heating, and cooling cycles were found not significantly different (95% confidence). This indicates that in mathematical models a constant h value may be assumed for the three thermal processing stages. Also, there was no significant difference between h values for aluminum foil/plastic laminate pouches and all‐plastic pouches during the combined come‐up and heating stages. Thus, the same h value for a given process is applicable to either pouch type.