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提出了简化的弯通道模型 .根据多孔物料的结构和干燥过程的特点 ,通过实验观测湿分在一定压力差作用下的迁移行为 ,着重研究快速干燥过程中多孔介质内部湿分的挤压流动现象 .实验结果表明在一恒定温度下 ,当干燥物料两端的压力差逐渐增大时 ,湿分由物料内部到达外表面所需的时间逐渐减小且在相同的压力差降下 ,时间减小的幅度越来越小 .在相同的压力差下 ,当液体温度升高时 ,湿分由物料内部到达外表面所需的时间随之减小
A simplified curved channel model is proposed.According to the structure of the porous material and the characteristics of the drying process, the migration behavior of the moisture under certain pressure difference is observed experimentally, focusing on the squeezing flow phenomenon of the moisture in the porous medium during the rapid drying process The experimental results show that at a constant temperature, when the pressure difference between the two ends of the dry material gradually increases, the time required for the moisture to reach the outer surface from the inside of the material gradually decreases, and at the same pressure drop, the time decrease Smaller and smaller.With the same pressure difference, as the temperature of the liquid increases, the time required for the moisture to reach the outer surface from the inside of the material decreases