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首页> 外文会议>Wood anatomy research 1995 >A study on fluid permeability of important Chinese woods
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A study on fluid permeability of important Chinese woods

机译：中国重要木材的流体渗透性研究

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This paper dealt with the longitudinal air permeability of 40 important Chinese woods. Their permeable characteristics and laws were revealed. The air permeabilities measured at about 10% M. C. for softwoods were between 0.00957 and 1.87173 darcy, while for hardwoods were 0.00195 to 13.49867 darcy. The permeability of sapwood of both softwoods and hardwoods was much higher than that of heartwood. The permeability of wood was not related to its density in the same or different species. In the 40 species studied, the permeability of heartwood of all softwoods, about 70% ring- porous and about 30% diffuse porous or semidiffuse porous woods was below 0.1 darcy, which belonged to a low range of permeability. The species of low permeability in softwoods were more than that in hardwoods because the numbers of cell cross per unit length in axial direction which hinder flow of fluid in the former were more than that in the latter. The species of low permeability in ring porous hardwoods were more than that in diffuse porous or semidiffuse porous hardwoods as a result of the existence of tyloses or resin which obstructed vessels and pit membrane openings between vessels. As far as softwood was concerned, the difference of permeability relied on the effective radius and number of pit membrane openings, as for ring-porous woods was also dependent on the existence and number of tyloses or resin in the vessels, even the number and size of openings in the tyloses in addition to the pit membrane openings between vessels, and as for diffuse or semi-diffuse porous hardwoods resulted from the radius and number of pit membrane openings between vessels, the type of perforation plate contained in the vessels and the radius and number of vessles.
机译：本文研究了40种中国重要木材的纵向透气性。揭示了它们的渗透特性和规律。在约10％的M.C下测得的软木的空气渗透率为0.00579-1.873173达西，而硬木为0.00195-13.867867达西。软木和硬木的边材渗透性都比心材高。在相同或不同物种中，木材的渗透性与其密度无关。在所研究的40个树种中，所有软木，约70％的环状多孔木和约30％的扩散多孔或半扩散多孔木的心材渗透率均低于0.1达西，属于较低的渗透率范围。软木中低渗透率的物种比硬木中的低，这是因为前者中阻碍流体流动的轴向每单位长度的泡孔数目要多于后者。环状多孔硬木中低渗透率的种类比扩散多孔或半扩散多孔硬木中的低，这是由于存在tyloses或树脂阻塞了容器和容器之间的凹膜开口。就软木而言，渗透率的差异取决于有效半径和孔膜开口的数量，而对于环状多孔木，其渗透率也取决于容器中酪醇或树脂的存在和数量，甚至数量和尺寸。除容器之间的凹坑膜孔外，在胎盘上还有许多孔，对于扩散或半扩散的多孔硬木，是由于容器之间的凹坑膜孔的半径和数量，容器中包含的穿孔板的类型和半径和船只的数量。

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