Microwaves have been widely used in the treatment of materials, such as heating, drying,\nand sterilization. However, the heating in the commonly used microwave applicators is usually\nuneven. In this paper, a novel multi-material turntable structure is creatively proposed to improve the\ntemperature uniformity in microwave ovens. Three customized turntables consisting of polyethylene\n(PE) and alumina, PE and aluminum, and alumina and aluminum are, respectively, utilized in\na domestic microwave oven in simulation. During the heating process, the processed material\nis placed on a fixed Teflon bracket which covers the constantly rotating turntable. Experiments\nare conducted to measure the surface and point temperatures using an infrared thermal imaging\ncamera and optical fibers. Simulated results are compared qualitatively with the measured ones,\nwhich verifies the simulated models. Compared with the turntables consisting of a single material,\na 26%ââ?¬â??47% increase in temperature uniformity from adapting the multi-material turntable can be\nobserved for the microwave-processed materials.
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