Abstract The multimode resonant cavity is the most common cavity. The material often shows on selective heating performance during the heating process due to the effect of microwave heating having a closely relationship with the electromagnetism parameters. This paper is based on finite difference time domain method (FDTD) to establish the electromagnetic-thermal model. The electromagnetic sensitivity property parameters of sodium chloride including relative dielectric constant, loss angle tangent and water content of sodium chloride is studied during the heating and drying process. The heating rate and the electric field distribution of sodium chloride, at the different water content, were simulated with the electromagnetic characteristic parameters changing. The results show that with the electromagnetic sensitivity property parameters varying, the electric field strength, heating rate and steady-state temperature of the heating material will all have a variety in the cavity. Some measures are proposed to improve the heating efficiency and ensure the stability of the microwave heating system in the industrial application.

中文翻译：

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氯化钠微波加热电磁敏感性特性研究

摘要 多模谐振腔是最常见的谐振腔。由于微波加热的作用与电磁参数密切相关，材料在加热过程中往往表现出选择性加热性能。本文基于有限差分时域法(FDTD)建立电磁热模型。研究了氯化钠在加热干燥过程中的电磁敏感特性参数，包括相对介电常数、损耗角正切和氯化钠的含水量。模拟了不同含水量下氯化钠的加热速率和电场分布，并改变了电磁特性参数。结果表明，随着电磁灵敏度特性参数的变化，加热材料的电场强度、加热速率和稳态温度在型腔中都会有变化。提出了一些提高加热效率和保证微波加热系统在工业应用中的稳定性的措施。