Multiphysics analysis for unusual heat convection in microwave heating liquid
Peiyang Zhao,
Weiwei Gan,
Chuanqi Feng,
Zhongxing Qu,
Jianlong Liu,
Zhe Wu,
Yubin Gong,
Baoqing Zeng
Affiliations
Peiyang Zhao
School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu 611731, China
Weiwei Gan
School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu 611731, China
Chuanqi Feng
School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu 611731, China
Zhongxing Qu
School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu 611731, China
Jianlong Liu
School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu 611731, China
Zhe Wu
School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
Yubin Gong
School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu 611731, China
Baoqing Zeng
School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu 611731, China
Usually, the fluidity of liquids is considered to make the temperature field uniform, when it is heated, because of the heat convection, but there is something different when microwave heating. The temperature of the top is always the highest in the liquid when heated by microwaves. In this paper, the multiphysics simulation and experimental comparison of the temperature distribution of microwave heated water and alcohol and microwave reheated rice are performed. In order to make the temperature distribution of liquids heated by microwaves uniform, the cut-off waveguide is used to control microwave heating and improve the temperature uniformity. The experimental results show that when the modified glass cup with 7 cm metal coating is used to heat water in a microwave oven, the temperature difference between the upper and lower parts of the water is reduced from 7.8 °C to 0.5 °C. The modified glass cup is placed in the center of the ceramic plate, far away from the cavity wall, and there is no spark ignition.
