Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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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)
  • Received : 2015.08.10
  • Accepted : 2015.08.24
  • Published : 2015.09.01
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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.

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References

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