超声波预处理对桉木干燥时间的影响  

Effects of Ultrasound Pretreatment on Drying Time of Eucalyptus Wood

作　　者：姚幸之 姚孜银 何正斌[1] 伊松林[1] 

机构地区：[1]北京林业大学木材科学与工程北京市重点实验室,木质材料科学与应用教育部重点实验室,北京100083

出　　处：《木材工业》2016年第5期9-12,共4页China Wood Industry

基　　金：国家自然科学基金“超声波协同下的木材真空过热蒸汽干燥水分迁移机制”(31270604);北京林业大学“北京市大学生科学研究与创业行动计划”(S201510022048)

摘　　要：以巨尾桉(Eucalyptus grandis×E.urophylla)木材为试材,在功率为340 W,频率为25和59 k Hz的条件下,分别进行30、60和90 min的超声波预处理,对比分析超声波预处理对桉木干燥时间的影响。结果表明,试材的干燥速率和水分扩散系数,均随超声波频率提高、预处理时间增加而增大;尤其当含水率在纤维饱和点以上时,超声波预处理对试材干燥时间的缩短效果更明显。Eucalyptus grandis×E. urophylla wood samples were pretreated by ultrasound at 340 W power with frequency of 25 and 59 k Hz for 30, 60 and 90 minutes, respectively, and the effects of ultrasound pretreatment on drying time of the eucalyptus wood samples were investigated. Results indicated that ultrasound pretreatment could decrease drying time and increase water diffusivity of the wood samples.Moreover, drying rates and water diffusivity increased along with increase of ultrasound frequency and pretreatment time. The effect of ultrasound pretreatment on shortening drying time was very obvious when wood moisture content of the samples was above fiber saturation point.

关 键 词：超声波 预处理 干燥时间 水分扩散系数 纤维饱和点 

分 类 号：S782.31[农业科学—木材科学与技术]