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Abstract
While microwaves have many features and advantages, problems may occur, including non-heating, partial overheating, and fire due to damaged magnetrons caused by reflected waves, when they are used without a proper understanding of the permittivity of the object to be heated, the electromagnetic field distribution, the matching between the chamber and the waveguide, and the reflected electromagnetic waves. Simulation was performed using the Ansys HFSS tool. Conditions for the uniform electromagnetic field were derived using the distance from the waveguides to the ceramic material as well as the microwave energy intensity as major parameters.
Highlights
Microwaves are powerful energy sources with excellent reproducibility that can be applied to many applications
Electromagnetic wave absorption causes macroscopic, microscopic, and structural changes in the material shape, and the electric field distribution is a major element that affects the process of heating the material in a microwave chamber
Simulation results showed that the microwave intensity affected the electric field distribution and that higher microwave intensity led to better electric field uniformity
Summary
Microwaves are powerful energy sources with excellent reproducibility that can be applied to many applications. Microwave energy has been applied in a variety of industries It has reduced work hours and improved product quality by using uniform heating. In the case of ceramic processes including water, a significantly fast drying speed can be achieved and the non-uniformity of humidity, depending on the position, can be improved using microwaves because the temperature distribution is opposite to that of the existing method. Electromagnetic wave absorption causes macroscopic, microscopic, and structural changes in the material shape, and the electric field distribution is a major element that affects the process of heating (processing) the material in a microwave chamber. Conditions for the uniform electromagnetic field were derived using the distance from the waveguides to the ceramic material as well as the microwave energy intensity as major parameters
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