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›› 1993, Vol. 29 ›› Issue (3): 248-256.

• 论文及研究报告 • 上一篇    下一篇

木材可压缩流体渗透中滑流的研究

鲍甫成 吕建雄   

  1. 中国林业科学研究院木材工业研究所,北京100091
  • 收稿日期:1991-12-25 修回日期:1900-01-01 出版日期:1993-05-25 发布日期:1993-05-25

A STUDY ON SLIP FLOW OF THE COMPRESSIBLE FLUID THROUGH WOOD

Bao Fucheng,Lǖ Jianxiong   

  1. Research Institute of Wood Industry,Chinese Academy of Forestry, Beijing 100091
  • Received:1991-12-25 Revised:1900-01-01 Online:1993-05-25 Published:1993-05-25

摘要: 在气体平均压力倒数为1.4-48atm(-1)范围内测定了长白鱼鳞云杉和红松木材可压缩流休渗透中滑流效应及影响滑流的因素,论述了木材中流体流动形态和机理。研究表明,两种木材可压缩流体渗透中均产生滑流,但长白鱼鳞云杉中滑流高于红松。前者滑流渗透性与真渗透性百分比、比名义渗透性与真渗透性比、滑流因素分别为69.39%、1.69、0.356atm;后者分别为37.64%、1.376、0.197atm。滑流的大小与木材有效毛细管半径、真渗透性和气体平均压力有高度紧密相关。木材有效毛细管半径愈小,真渗透性愈低,或气体平均压力愈低,则滑流效应愈大。

关键词: 长白鱼鳞云杉, 红松, 滑流, 渗透性

Abstract: This paper presented types and mechanisms of the compressible fluid such as air flow through wood. The slip flow and factors affecting the compressible fluid flow through spruce (Picea jezoensis var. komarovii) and pine(Pinus koraensis) woods along grain direction were measured over a rangeof the reciprocal average pressure from 1.4 to 48 atm-1. The slip flow wasobserved in the air permeability of woods of the two species mentioned above,however, the slip flow component of spruce wood was higher than thatof pine. The slip flow percentage of viscous flow (KS/KT%) and the ratio ofspecific superficial air permeability to the true permeability (KG/KT) at 0.5atm, as well as the slip flow factor b were calculated as 69.39%, 1.69 and0.356 atm respectively for spruce wood and 37.64%1.36 and 0. 197 atm for pine.The slip flow was inversly proportional to effective capillary radius of woodtrue permeability and average air pressure.

Key words: Picea jezoensis var komarovii, Pinus koraensis, Slip flow, Fluid permeability