A 2D axi-symmetric theoretical model of dielectric porous media in intermittent microwave (IMW) thermal process was developed, and the electromagnetic energy, multiphase transport, phase change, large deformation, and glass transition were taken into consideration. From the simulation results, the mass was mainly carried by the liquid water, and the heat was mainly carried by liquid water and solid. The diffusion was the dominant mechanism of the mass transport during the whole process, whereas for the heat transport, the convection dominated the heat transport near the surface areas during the heating stage. The von Mises stress reached local maxima at different locations at different stages, and all were lower than the fracture stress. A material treated by a longer intermittent cycle length with the same pulse ratio (PR) tended to trigger the phenomena of overheat and fracture due to the more intense fluctuation of moisture content, temperature, deformation, and von Mises stress. The model can be extended to simulate the intermittent radio frequency (IRF) process on the basis of which one can select a suitable energy source for a specific process.

中文翻译：

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间歇微波处理可变形多孔介质的数值研究

建立了微波在间歇微波（IMW）热过程中的二维轴对称理论模型，并考虑了电磁能，多相输运，相变，大变形和玻璃化转变。根据模拟结果，质量主要由液态水携带，热量主要由液态水和固体携带。在整个过程中，扩散是传质的主要机制，而对于传热，对流在加热阶段主导着表面积附近的传热。von Mises应力在不同阶段的不同位置达到局部最大值，并且都低于断裂应力。具有更长的间歇周期长度且具有相同脉冲比（PR）的材料往往会由于水分，温度，变形和冯·米塞斯应力的剧烈波动而引发过热和破裂现象。该模型可以扩展为模拟间歇射频（IRF）过程，在此基础上可以为特定过程选择合适的能源。