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Title: A novel atmospheric freeze-drying system using a vortex tube and multimode heat supply
Authors: Rahman, S.M.A.
Mujumdar, A.S. 
Keywords: Atmospheric freeze-drying
Drying kinetics
Heat pump drying
Multimode heat input
Physical properties
Postharvest technology
Vacuum freeze-drying
Vortex tube
Issue Date: Nov-2008
Citation: Rahman, S.M.A.,Mujumdar, A.S. (2008-11). A novel atmospheric freeze-drying system using a vortex tube and multimode heat supply. International Journal of Postharvest Technology and Innovation 1 (3) : 249-266. ScholarBank@NUS Repository.
Abstract: This article presents results of an experimental study of (AFD); atmospheric freeze-drying which uses a vortex tube to produce low temperature air, as an alternative to vacuum freeze-drying (VFD). An experimental setup was designed and built to permit simultaneous application of convection, conduction and radiation heat input to the drying material without heating it above the freezing point of water contained in it. Potato slices were used as a model heat sensitive product for testing. Four heat input schemes were compared experimentally: Case 1 - pure convection, Case 2 - two-stage convection, Case 3 - radiation-coupled convection and Case 4-radiation -conduction-coupled with convection. Drying kinetics, quality parameters and physical properties of the model product (colour, rehydration properties, scanning electron micrographs) were analysed. Experiments were also conducted in a well-instrumented heat pump dryer and a vacuum freeze dryer for direct comparison with the AFD results. The proposed AFD system is shown to be a viable alternative to vacuum freeze-drying. Copyright © 2008 Inderscience Enterprises Ltd.
Source Title: International Journal of Postharvest Technology and Innovation
ISSN: 17447550
DOI: 10.1504/IJPTI.2008.021460
Appears in Collections:Staff Publications

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