ASYMMETRY IN FREEZE‐DRYING

• Published in: Journal of Food Science
• Main Authors: ZARKARIAN, J. ALEKSONIS, KING, C. JUDSON
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1978
• Subjects: ice core
• Online Access: http://dx.doi.org/10.1111/j.1365-2621.1978.tb02469.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2621.1978.tb02469.x; http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1365-2621.1978.tb02469.x/fullpdf

ABSTRACT This paper describes what is meant by asymmetric freeze‐drying and reports experimental observations of the phenomenon. Current mathematical models of freeze‐drying cannot account for asymmetry. This theoretical deficiency is corrected by the development and solution of a freeze‐drying theory termed the asymmetrically‐retreating‐ice‐front (ARIF) model. An extension of the well‐known uniformly‐re‐treating‐ice‐front (URIF) model, the ARIF theory accounts for heat flux through the frozen region and for unequal heat fluxes to different sample faces. The ARIF theory is able to predict temperatures and moisture fractions during drying, total drying times, and degrees of ice‐core asymmetry which agree reasonably well with experimental results.