Application of Microwave Heating of Liquid Food in a Single-mode Resonant Cavity
Date Issued
2008
Date
2008
Author(s)
Tsao, Yu-Hsin
Abstract
Although microwave single-mode resonant cavities for the purpose of heating have been developed for a long time, however, there are few researches concentrated on engineering design procedure to development a resonant cavity for heating of liquid food continuously with acceptable efficiency.n this study an effective procedure for design of a continuous microwave heating system for liquid food was developed. The major component of the system was a TM010 mode cylindrical resonant cavity which being excited by a rectangular TE10 waveguide with 2.45GHz electromagnetic wave. Liquid flew through and microwave heated in tubing centered in the cavity. Impendence match that might vary with dielectric properties of the heated fluid was the most difficult task for the design. In this study we found that the impendence of the cavity could be easily varied by changing the diameter of the liquid tubing. We used commercial software COMSOL Multiphysics as a design tool to simulate electrical energy filed in the cavity and calculate scattering parameter (S-parameter) as an index for power transmission efficiency and response surface method to obtain the optimum diameter of tubing for model food with various dielectric properties. The designing procedure was validated with experimental works.ur results point out under good impendence match, the heating efficiency can reach 90% and 80% for 2% NaCl solution and 10% glucose solution respectively and the designing procedure developed in this study provides an effective method for design of single-mode microwave heater at any resonant modes.
Subjects
Microwave heating
Single-mode cavity
FEM method
Dielectric property
Type
thesis
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