针叶树材管胞气体渗透流阻及其渗透系数  

THE FLOW-RESISTOR AND GAS PERMEABILITY OF SOFTWOOD TRACHEID

作　　者：鲍甫成[1] 侯祝强[1] 

机构地区：[1]中国林业科学研究院木材工业研究所,北京100091

出　　处：《林业科学》2001年第4期80-87,共8页Scientia Silvae Sinicae

基　　金：国家"九五"攀登计划项目 (95 专 0 7)

摘　　要：针叶树材气体渗透性与气体在管胞中的流动特性和规律紧密相关 ,研究管胞的气体渗透流阻 ,可以获得关于针叶树材气体渗透性更深入的认识。本文从针叶树材管胞解剖结构出发 ,运用流体力学理论 ,导出了管胞 3个纹理方向渗透气体流阻的数学表达式 ,并由此计算了针叶树材管胞的气体渗透系数。计算结果表明 ,管胞流阻可以描述气体渗透阻力的分布情况 ,反映气体渗透性在 3个纹理方向的差异 ,在木材细胞层次揭示针叶树材气体渗透性的机制。The average percentage of tracheid volume is over 90% for softwoods species. Gas permeability of softwoods is in close relationship with the flow of gas through the tracheids. The thorough knowledge of the gas permeability of softwoods can be gained by the flow-resistor of tracheids for the flow of gas. Based on the structural model for tracheid, the expressions of flow-resistors of tracheid in three directions of grain are reduced with the theories of fluid mechanics. The gas permeability of tracheids also calculated from their flow-resistors in this paper. The calculation show that flow-resistor can depict the resistance distribution in tracheid and the differences in gas permeability in three directions of grain. The flow-resistor is a useful way of studying on the gas permeability of softwoods and it can reveal the flow nature of gas through wood at level of woody cells.

关 键 词：气体渗透性 流阻 线性流 管胞 针叶树材 气体渗透系数 纹理方向 

分 类 号：S781.82[农业科学—木材科学与技术] S781.35[农业科学—林学]