| 木材真空-浮压干燥过程中自由水迁移特性 |
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| 引用本文： | 伊松林,张璧光,常建民. 木材真空-浮压干燥过程中自由水迁移特性[J]. 北京林业大学学报, 2003, 25(4): 59-63 |
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| 作者姓名： | 伊松林 张璧光 常建民 |
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| 作者单位： | 北京林业大学木材干燥中心 |
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| 基金项目： | 国家自然科学基金;59876005; |
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| 摘 要： | 该文以马尾松为试验材料 ,通过对真空 浮压干燥中木材内部温度场、湿度场随压力浮动频率变化的试验研究 ,总结出木材在真空 浮压干燥过程中内部自由水迁移的基本规律 ,并对水分迁移的机制与驱动势进行了分析 .试验结果和理论分析显示 ,在真空 浮压干燥过程中自由水的输运由两部分完成 ,一部分为毛细管压力下液体的团块迁移 ;另一部分为在压力梯度下 ,由于压力波动而引起自由水的蒸发或沸腾后所产生的水蒸气的迁移 ,且后者在自由水的迁移过程中占主导地位 .
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| 关 键 词： | 木材干燥 真空 浮压 自由水迁移 |
Characteristics of free water movement in wood drying process under vacuum- floating pressure |
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| Yi Songlin, Zhang Biguang, Chang Jianmin. Characteristics of free water movement in wood drying process under vacuum- floating pressure[J]. Journal of Beijing Forestry University, 2003, 25(4): 59-63 |
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| Authors: | Yi Songlin Zhang Biguang Chang Jianmin |
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| Affiliation: | Yi Songlin, Zhang Biguang, Chang Jianmin.Center of Wood Drying,Beijing For. Univ.,100083,P. R. China. |
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| Abstract: | Using masson pine ( Pinus massoniana ) as the specimen, an experiment was carried out to study the effect of pressure floating frequency on temperature field and moisture field in wood. Based on this experiment, fundamental principles of free water movement in wood drying under floating pressure were summed up and mechanism and driving potential of water movement were analyzed. Results of experiment and theoretical analysis indicate that free water movement in wood under floating pressure consists of two parts, one is mass movement caused by capillary pressure, the other is the movement of water vapor produced by evaporation or ebullition of free water, and the latter dominates the moving process of free water. |
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| Keywords: | wood drying vacuum floating pressure movement of free water |
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