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http://dx.doi.org/10.5307/JBE.2015.40.3.250

Design and Fabrication of a Dual Cylindrical Microwave and Ohmic Combination Heater for Processing of Particulate Foods  

Lee, Seung Hyun (Department of Biosystems Machinery Engineering, Chungnam National University)
Choi, Won (Department of Rural Systems Engineering, Seoul National University)
Park, Sung Hee (Department of Human Nutrition, Food and Animal Sciences, University of Hawaii)
Jun, Soojin (Department of Human Nutrition, Food and Animal Sciences, University of Hawaii)
Publication Information
Journal of Biosystems Engineering / v.40, no.3, 2015 , pp. 250-260 More about this Journal
Abstract
Purpose: Dual cylindrical microwave chambers equipped with an ohmic heating tube were designed and fabricated to maximize the electric field strength for expeditious heat treatment of particulate foods. Methods: The efficacy of the combination heater was investigated by simulating the electric field distribution by using COMSOL Multiphysics software. Results: All components of the designed microwave heating unit were suitable for transmitting maximal microwave power to the load. The simulated electric field distribution implied that single-mode microwave heating would be sufficient for the steady generation of a highly localized heating zone in the cavity. During impedance matching, the calculated reflection coefficient ($S_{11}$) was small, possibly implying minimal power loss and wave reflection in the designed microwave heating chamber. Conclusions: This study demonstrates the possibility of concentrating the microwave power at the centerline for a single-frequency microwave, for thermal treatment of multiphase foods without attenuating the microwave power.
Keywords
3D simulation; Combination heating; Electric field distribution; Microwave; Ohmic heating;
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