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为了探究超声波场对多孔纤维干燥过程热湿迁移的影响,对有无超声波作用下多孔纤维的干燥过程进行了试验研究。试验结果表明:无超声波作用时,多孔纤维干燥包括恒速和降速两个阶段,且其转化临界点在干基含湿率为0.5左右;施加超声波场之后,干燥过程只有降速阶段,且随着功率的增加超声波的强化作用逐渐增强,功率和干燥速率呈现非线性关系;随着干燥过程的进行,含湿量降低,超声波的强化作用逐渐削弱;为了减少能耗当干基含湿率降低至0.5时即可终止干燥。
In order to explore the influence of ultrasonic field on the heat and moisture migration of porous fiber during drying process, the drying process of porous fiber with or without ultrasonic wave was studied. The experimental results show that the drying of porous fibers includes two stages of constant velocity and decelerating without ultrasonic wave, and the critical point of transformation is at a dry moisture content of about 0.5. After the application of ultrasonic field, the drying process has only a decelerating phase, and With the increase of power, the strengthening effect of ultrasonic wave gradually increases. The power and drying rate show a nonlinear relationship. As the drying process progresses, the moisture content decreases, and the strengthening effect of ultrasonic wave gradually weakens. In order to reduce energy consumption, the dry basis moisture content Reduce to 0.5 when the drying can be terminated.