针叶树材径向和弦向气体渗透的三维流阻网络

THE THREE-DIMENSIONAL FLOW-RESISTOR NETWORK FOR RADIAL AND TANGENTIAL GAS PERMEABILITY OF SOFTWOODS

将针叶树材气体渗透的三维流阻网络理论进行了扩充 ,提出了气体径向和弦向渗透次级流阻网络的二维等效流阻网络及二维等效流阻网络流阻基元的确定和等效流阻的求解方法 ,将三维流阻网络从关于针叶树材气体纵向渗透性研究 ,扩展到针叶树材气体径向和弦向渗透性研究。提出了针叶树材径向和弦向气体渗透三维流阻网络理论 ,计算了马尾松试件径向和弦向渗透系数 ,并与测量值进行比较 ,结果表明两值相符合。将本文的针叶树材径向和弦向气体渗透三维流阻网络理论与此前关于针叶树材纵向气体渗透的三维流阻网络工作相结合 ,可以使用三维流阻网络计算针叶树材纵向、径向、弦向的气体渗透系数 ,其在木材干燥、改性。

This paper developed the theory on the three dimensional flow resistor network for gas permeability of softwoods from longitudinal to radial and tangential directions. The two dimensional equivalent connection of the secondary flow resistor network was presented for the flow of gas in the radial and tangential direction. The method had been given in this paper to determine the number of flow resistor elements in the network and the way to resolve the network. The radial and tangential gas permeability of Masson pine ( Pinus massoniana ) was evaluated with the flow resistor network. Comparison is carried out between the calculated and measured values of radial and tangential gas permeability, and result shows that there is agreement between the both. The three dimensional flow resistor network can be use to describe the mechanism that gas flows through the softwoods and to evaluate the gas permeability in longitudinal, radial and tangential directions provided that the previous work on the longitudinal gas permeability joins up with those done in this paper. The work done in this paper is useful for wood processing.