中文摘要：

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。

英文摘要：

In order to investigate the effect of ultrasound on heat and moisture transfer in porous fiber dehydration,the drying process are experimental studied with and without ultrasonic.The experiments denote that,the drying process of porous fiber includes constant and falling rate period and the critical point for the two stages reaches when the dry basis moisture content is 0.5.In ultrasound assisted experiments,only falling rate period is observed;the enhancement of ultrasonic on dehydration can be strengthened by increasing power,but weakened by decreasing moisture content.Besides,a nonlinear relationship between ultrasound power and dehydration rate is concluded.The enhanced drying process can be stopped when the dry basis moisture content is 0.5 because of economic consideration.