文献类型：期刊文献

中文题名：干燥过程中木材内部孔隙度变化的初步研究

英文题名：Changes of wood interior porosity during the drying process

作者：费本华[1] 赵勇[1] 侯祝强[1] 赵荣军[1]

第一作者：费本华

通信作者：Fei, B.-H.

机构：[1]中国林业科学研究院木材工业研究所

年份：2005

卷号：0

期号：S1

起止页码：1-4

中文期刊名：北京林业大学学报

外文期刊名：Journal of Beijing Forestry University

收录：CSTPCD;;EI(收录号：2005519604585);Scopus(收录号：2-s2.0-29144517036);北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：木材;分形理论;内部孔隙度;分形维数

外文关键词：wood, fractal theory, wood interior porosity, fractal dimension

分类号：S782.31

摘要：该文采用一种全新的方法———分形理论来描述干燥过程中,木材内部孔隙度的变化情况.实验以银杏和板栗为试材,采用连续升温干燥的方法,并建立了不同干燥温度下木材重量和尺寸之间的双对数关系,计算得出木材内部孔隙度的分形维数.结果表明:木材内部孔隙度的分形维数是定量反映干燥过程中木材内部孔隙复杂程度新的有效指标.木材内部孔隙度分形维数的变化与干燥温度和木材含水率的变化相对应,随着干燥温度的升高,两种试材含水率逐渐降低,内部孔隙度的分形维数均逐渐增大,内部孔隙的复杂程度也增大.当干燥温度从20℃到100℃,试材从气干状态(含水率14%)到绝干状态,银杏木材内部孔隙度的分形维数变化在2.1057～2.8757之间,板栗的维数变化在2.0080～2.9238之间.板栗木材内部孔隙度的分形维数变化范围要比银杏大,说明在干燥过程中板栗内部孔隙变化的复杂程度要比银杏大,干燥银杏木材比干燥板栗木材相对容易,产生干燥缺陷的可能小于板栗.
The fractal theory was applied to describe the changes of wood interior porosity during the drying process. Ginkgo biloba and Castanea mollissima were chosen as test samples, and the drying temperature increased continuously. The double logarithmic relationship between the weight and size at different drying temperatures was established, and the slope of the straight line regressed was the fractal dimension of the wood interior porosity. The results showed that the fractal dimension is an effective index to quantitatively characterize the complexity of wood interior porosity during the drying process. The fractal dimension varies according to the changes of drying temperature and the moisture content of wood. With the drying temperature increasing and the moisture content decreasing, both the fractal dimension and complexity of wood interior porosity increase. When the drying temperature changed from 20 to 100℃, the wood moisture content changed from 14% to 0, the fractal dimension of G. biloba ranged from 2.105 7 to 2.875 7, and that of C. mollissima from 2.008 0 to 2.923 8. The fractal dimension of interior porosity of C. mollissima varied more broadly than that of G. biloba under the same condition. It indicates the complexity of interior porosity of C. mollissima is higher than that of G. biloba. It is relatively easy to dry G. biloba timber than C. mollissima because the probability of occurrence of drying defects in G. biloba is lower than that in C. mollissima.