吸湿性多孔材料介电特性表征

微波加热干燥吸湿性多孔材料相比于传统干燥方法大大缩短了干燥时间。然而,微波干燥过程中出现的加热不均匀等问题严重限制了微波加热干燥吸湿性多孔材料应用的发展。上述问题主要是由于微波干燥过程中吸湿性多孔材料的介电特性的精确描述缺少可以实际应用的理论。文章在总结多孔材料介电特性描述理论的基础上,综合考虑吸湿性多孔材料内部微观结构,并把多孔材料中不同类型的水和颗粒形状与吸湿性多孔材料介电特性联系起来,提出适应于微波加热干燥吸湿性多孔材料多物理场计算的材料介电特性表征理论。

Compared with the traditional drying method, microwave heating can greatly shorten the drying time of porous materi-als. However, the problems of uneven heating during microwave drying seriously limit the development of microwave heating for the application of hygroscopic porous materials. The above problems are mainly due to the lack of practical theory for the accurate de-scription of the dielectric properties of hygroscopic porous materials during microwave drying. On the basis of summarizing the theory of describing the dielectric properties of porous materials, the microstructure of hygroscopic porous materials is considered comprehen-sively in this paper. Different types of water and particle shapes in porous materials are associated with the dielectric properties of hygroscopic porous materials. A theory of characterization of dielectric properties of porous materials by microwave heating is present-ed, which is suitable for multi-physical field calculation.