Abstract : The variation of microwave drying speed, temperature gradient and water content gradient of Pinus massoniana wood with time was studied. The experimental results show that the microwave continuous drying process is obviously divided into three stages: acceleration section, constant velocity section and deceleration section. The constant velocity section accounts for the largest proportion in the whole drying process.
During the microwave drying process, the temperature change is roughly divided into three stages: initial temperature rise, isothermal and late temperature rise. The temperature distribution in the initial temperature rise and isothermal stages is relatively uniform, and the temperature difference in the wood in the late heating stage gradually increases. During the microwave drying process, the initial moisture content gradient of the wood was not increased over the entire cross section, but was evenly homogenized, and even the moisture content of the wood surface increased.
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