Role of convective heat removal and electromagnetic field structure in the microwave heating of materials
Role of convective heat removal and electromagnetic field structure in the microwave heating of materials
复制标题
对流散热和电磁场结构在材料微波加热中的作用
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
V. Lelevkin
中科院分区：
文献类型：
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作者：
S. V. Egorov;K. Rybakov;V. Semenov;Y. Bykov;O. N. Kanygina;É. Kulumbaev;V. Lelevkin
通过数值模拟研究了低损耗介质样品在微波加热过程中的温度分布。对流散热已被证明在样品的能量平衡中起着决定性作用。将获得的温度分布与专门设计的多通道温度测量微波加热实验的结果进行了比较。样品表面的温度与对流散热的模拟非常吻合。样品内部测得的温度高于模拟预测的温度。电动力学计算表明，由于衍射效应，即使样品受到微波各向同性的照射，样品内部的电磁场也是不均匀的。由此可见，为了准确模拟微波加热过程，需要考虑空气对流并计算样品内部的电磁场结构。
The temperature distributions arising in a low-loss dielectric sample in the process of microwave heating have been studied by means of numerical simulation. The convective heat removal has been demonstrated to play the determining role in the energy balance of the sample. The obtained temperature distributions have been compared with the results of a purposely designed microwave heating experiment with multi-channel temperature measurement. The temperature on the surface of the sample agreed well to the simulation accounting for convective heat removal. The temperature measured inside the sample was higher than predicted by simulation. The electrodynamic calculations have shown that due to diffraction effects the electromagnetic field inside the sample is inhomogeneous even if the sample is irradiated by microwaves isotropically. Thus, it is concluded that in order to simulate the microwave heating process accurately, it is necessary to account for air convection and calculate the structure of electromagnetic field inside the sample.