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Title: Theoretical study of microwave heating patterns on batch fluidized bed drying of porous material
Authors: Chen, G.
Wang, W.
Mujumdar, A.S. 
Keywords: Apple
Bed area factor
Drying rate
Energy consumption
Issue Date: 14-Dec-2001
Citation: Chen, G., Wang, W., Mujumdar, A.S. (2001-12-14). Theoretical study of microwave heating patterns on batch fluidized bed drying of porous material. Chemical Engineering Science 56 (24) : 6823-6835. ScholarBank@NUS Repository.
Abstract: The effects of microwave heating patterns were investigated for the case of batch fluidized bed drying by solving numerically a coupled heat and mass transfer model. Three patterns, uniform, sinusoidal and rectangular waves, were examined with the average electric field strength kept constant at 1000 V/m. Properties of apple were used to represent porous materials. The results show that the magnitude and distribution of the moisture, temperature and pressure within a particle can be significantly affected. More importantly, the drying time and microwave energy consumption change with the pattern of how microwave heating is applied. Particularly, intermittent heating with a rectangular wave pattern has the most microwave energy consumption but the shortest drying time. For a particle size of 5 mm, airflow rate of 2 m/s and temperature of 60°C, the bed area factor fA of 100, the drying time is, respectively, 1600, 2000, 2400 s for rectangular, sinusoidal, and constant microwave heating. The values of microwave energy consumed for the three cases are, respectively, 2145, 1980, and 1560 kJ/kg water evaporated. © 2001 Published by Elsevier Science Ltd.
Source Title: Chemical Engineering Science
ISSN: 00092509
DOI: 10.1016/S0009-2509(01)00320-7
Appears in Collections:Staff Publications

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