硬木中流体移动的双尺度多孔机理的依据(I)用多色X光束测定榉木浸润中湿含量的演变

编号 zgly0000342539

文献类型 期刊论文

文献题名 硬木中流体移动的双尺度多孔机理的依据(I)用多色X光束测定榉木浸润中湿含量的演变

学科分类 220.5550;木材加工与人造板工艺学

作者 PatrickPERRE  FrancoisTHIERCELIN 

作者单位 LERMAB-UMRINRA/ENGREF/U-HP1093  ENGREF-INRA-14  rueGirardet54042NancyCedex  France 

母体文献 Chinese Journal of Chemical Engineering;中国化学工程学报: 英文版 

年卷期 2004,12(6)

页码 773-782

年份 2004 

分类号 TS652 

关键词 木材加工  硬木  流体移动  双尺度多孔机理  多色x光束  测定  榉木  浸润  湿含量 

文摘内容 An experimental device able to determine the moisture content of wood using X-ray attenuation is used to study the imbibition of beech samples (Fagus silvatica). The apparatus includes an X-ray generator, a protective tube, coUimating plates and a 50 mm detector. Detected particles can be categorised by energy (accuracy of the order of 20%) or by position (accuracy 100μm). The independent choice of both the energy spectrum (through the voltage) and the counting rate (through the current intensity) makes the installation very flexible. However,a rigorous treatment is necessary to deal with the attenuation of a polychromatic spectrum. The appropriate calculations are presented and validated with homogeneous samples made of wood and water. In addition, some results are presented with samples heterogeneous in density and moisture content. Finally, the experimental device is used to study the evolution of moisture content during saturation experiments, for which the moisture migration is mainly due to capillary forces. The geometrical configuration was so arranged that the transfer can be studied in two directions simultaneously。