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作 者 ：鲍甫成

期 刊 ：林业科学 1993年 29卷 6期 页码：521-530

关键词：渗透性；平均有效纹孔膜微孔半径；气-液界面；

Keywords:Permeability, Mean effective pit membrane pore radius, Gas-liquid interface, Capillary tension,

摘 要 ：论述了测定木材具有流体可渗性有效毛细管半径和数量的方法和原理,研究了长白鱼鳞云杉、红松和白桦木材具有流体可渗性有效毛细管结构,讨论了它在生产实践中的应用可能性。结果表明,长白鱼鳞云杉和红松木材纵向气体渗透性与平均压力倒数为线性关系,表明流体在这两种针叶材中流动阻力主要来自于纹孔膜微孔,具有流体可渗性平均有效纹孔膜微孔半径分别为0.61和0.98μm,单位面积上具有流体可渗性有效纹孔膜微孔数为1218和605/cm²。白桦木材纵向气体渗透性与平均压力倒数的关系表明,该种木材试样中存在有高、低两种传导结构——导管腔和梯状穿孔串联起来的渗透路径,平均有效导管腔半径为59.8μm,梯状穿孔半径为2.01μm,单位面积上有效导管数为645/cm²。

Abstract:This paper presented the theory of the measuring mean effective radiiand numbers of capillary in wood. A study on the effective capillary structure of wood was discussed. Linear plots of axial gas permeability vs. Reciprocal mean pressure were obtained for spruce (Picea jezoensis var. komarovii)and pine (Pinus koraensis) in agreement with Klinkenberg equation, whichindicate nearly all of the resistance to flow is due to the pit membrane pore.Mean effective pit membrane pore radius(γ₂) was 0.61 and 0.95μm for spruceand pine. The number of conductive pit membrane pore per cm^{2 of cross section(n_(pc)) was calculated, yeilding valus of 1218/cm2 for spruce and 605/cm2 forpine. The plot of axial permeability vs. reciprocal mean pressure of thebirch (Betula platyphylla) was curvilinear, indicating presence of the conductances in series, which were assumed to be vessel and scalariform perforation plates. The calculated vessel radius (γ₁) and vessel concentration (n_(tc)) were59,8 μm and 645/cm2. The radius of the opening(γ₂) in the scalariform perforation plates was 2.01μm.}

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