It can be said that the microwave radiation power has a significant effect on the temperature variation characteristics of wood. The higher the power is, the faster the heating rate is, and the shorter the isothermal time is. The thicker the sample is, the slower the heating rate is, but the difference is not big. The temperature distribution inside the wood during the microwave drying process is abnormal. The temperature distribution inside the wood is uniform, and the temperature gradient from the center to the wood surface is not ten. The temperature of wood increased during the late stage of drying.
Distribution and variation of water content field in wood during
During microwave drying of wood, the moisture distribution in wood interior is very different from that in conventional drying. In conventional drying, the moisture movement speed of interior is usually less than that of evaporation on the surface of wood, and the surface layer reaches below the fiber saturation point rapidly, and the central part is larger. Water content gradient. In the process of microwave vacuum drying, the moisture content distribution in wood showed different laws.
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