| 微波真空干燥过程中木材内的水分迁移机理 |
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| 引用本文： | 李贤军,吴庆利,姜伟,张璧光.微波真空干燥过程中木材内的水分迁移机理[J].北京林业大学学报,2006,28(3):150-153. |
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| 作者姓名： | 李贤军 吴庆利 姜伟 张璧光 |
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| 作者单位： | 1.北京林业大学生物科学与技术学院 |
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| 基金项目： | 中国科学院资助项目
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中南林业科技大学校科研和校改项目 |
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| 摘 要： | 该文以马尾松木材为研究对象，对微波真空干燥过程中木材内部的含水率分布进行了研究，首次阐述了微波真空干燥过程中木材内部的水分迁移机理.研究结果表明:在微波真空干燥过程中，木材内部的含水率分布比较均匀，在厚度方向没有明显的整体性含水率梯度，特别是在干燥的后期，木材内部的含水率分布更加均匀；当含水率在纤维饱和点(FSP)以上时，木材中的自由水和水蒸气在压力梯度的作用下以渗透流的形式在木材内部迁移；当含水率在FSP以下时，木材中的水分在压力梯度的作用下以水蒸气的形式向木材表面迁移；因热扩散、含水率梯度引起的水分迁移可以忽略不计.
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| 关 键 词： | 干燥 微波真空 水分迁移 木材 |
| 文章编号： | 1000-1522（2006）03-0150-04 |
| 收稿时间： | 07 15 2005 12:00AM |
| 修稿时间： | 2005-07-15 |
Mechanism of moisture movement in wood during microwave-vacuum drying |
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| LI Xian-jun,WU Qing-li,JIANG Wei,ZHANG Bi-guang.Mechanism of moisture movement in wood during microwave-vacuum drying[J].Journal of Beijing Forestry University,2006,28(3):150-153. |
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| Authors: | LI Xian-jun WU Qing-li JIANG Wei ZHANG Bi-guang |
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| Institution: | 1,School of Industry, Central South University of Forestry and Technology, Changsha, 410004, P.R. China; 2, College of Material Science and Technology, Beijing Forestry University, 100083, P. R. China; 3,Forestry Science Company Limited, Beijing Forestry University, 100083, P. R. China; 4, Management Office of Wood Transportation, Forestry Department of Jilin Province, 130020, P. R. China |
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| Abstract: | Based on the research of moisture content distribution in Masson pine,the mechanism of moisture transfer through wood dried by microwave-vacuum(MV) was revealed.The results indicated that,during MV drying,moisture distribution in wood was relatively uniform,without an obvious moisture content gradient along the direction of thickness of wood.Moisture distribution in wood was more uniform in the last period of drying.Above Fiber Saturation Point(FSP),the movement of moisture through wood was assumed to be permeable movement of free water and vapor under the action of pressure gradient;below FSP,moisture existing in vapor form in wood moved in response to a pressure gradient.Moisture transfer caused by heat diffusion and a moisture content gradient could be neglected. |
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| Keywords: | drying microwave-vacuum moisture transfer wood |
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