Abstract
The recent rapid growth of the semiconductor industry in development of high power microwave source has open a new promising avenue by full electronic control over the electromagnetic field towards improve the microwave heating performance. In this paper, a coupled electromagnetic and heat transfer model was built to simulate microwave heating of multiple chicken blocks with temperature-dependent dielectric properties dependent on a solid-state microwave oven. Owing to the ability of solid-state source to precisely control the frequency, the temperature distribution simulated for the fixed frequency was compared with different frequency-shifted rates increasing process and decreacsing process between 2.4 GHz and 2.5 GHz. The simulated temperature distribution was validated by comparing with experimental temperature profiles obtained using a thermal imaging camera at the end of microwave heating. The results demonstrated the heating uniformity and efficiency is highly influenced by the head and tail frequency but also the frequency shifted rate. And a specific frequency-shifted rate decreasing process between 2.4 GHz and 2.5 GHz was proposed in improving the heating performance.
Highlights
In 1947, the advent of the first household microwave oven opened the era of wide application in microwave heating for its rapidity and convenience in cooking
The main objective of this study is to develop a comprehensive and integrated model dependent on a solid-state source microwave oven to predict temperature profiles during microwave heating of multi-component chicken blocks
A coupled electromagnetic and heat transfer model of a solid-state source oven was established for simulating the heating process with variable frequencies of different frequency-shifted rates
Summary
In 1947, the advent of the first household microwave oven opened the era of wide application in microwave heating for its rapidity and convenience in cooking. Magnetrons were used for the generation of microwaves and the frequency of common household microwave ovens was fixed at 2.45 GHz. The fixed-frequency of microwave device mentioned in this paper is 2.45GHz. Due to a 70% power efficiency and its lower price, the magnetron has dominated this field over the past several decades [1]. Microwave heating usually leads to a non-uniform temperature distribution in a multimode cavity, since the electromagnetic scattering in complex cavities is significantly affected by its structure and several parameters of the heated materials [2].
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