提升微波加热均匀性的新型电介质基底

介绍并分析了一种新型的电介质基底，旨在提升微波加热的温度分布均匀性。该基底为非轴对称结构，由FR-4环氧玻璃纤维板与氧化铝制成，其几何参数的选定是以降低球形介质样品的平均温升变异系数为目的。为探究电介质基底对微波加热均匀性的影响，采用球形马铃薯为研究对象，利用COMSOL Multiphysics多物理场仿真软件模拟微波加热过程，并计算马铃薯的平均温升变异系数。仿真结果表明：相比于不加载基底直接加热，加载电介质基底加热的马铃薯样品的平均温升变异系数降低了40%以上。最后，进行实验测试验证计算的有效性，实验结果表明：实验测试与仿真计算结果一致，温度上升曲线吻合较好，使用该电介质基底可以有效改善微波加热的均匀性。

Designing a novel dielectric base for improvement of uniformity of microwave heating

This paper introduces and analyses a novel dielectric base plate with an asymmetric shape and dielectric property aiming to achieve a uniform temperature distribution over the heating sample. Firstly, the proposed dielectric base contains FR-4(FR-4 Epoxy Glass Cloth) and alumine and is located within a commercial microwave oven to heat a potato sample. The permittivity and geometric values of the base are the selected parameters to be optimized for the sake of lowering the Coefficient Of Variation(COV) of temperature on the spherical medium heating sample and improving heating uniformity. Secondly, calculation of the multiphysical field simulation is applied to simulate the heating process. The simulation results based on COMSOL Multiphysics show that the COV decreases from 0.9134 to 0.5446 with the dielectric base. In other words, the COV declines by over 40%. Finally, an experimental system is built to measure the temperature of the heating sample to validate the simulations and calculations. Good agreements have achieved between the simulation and experiment, showing good consistence in temperature rise curves. It illustrates that the novel dielectric base can make the temperature uniformity of the heating sample improved.