Derivation of a New Expressions for Wood Transverse Thermal Conductivity and Comparison to Experimental Value | 木材横纹导热系数一种新的表达式的推导及与实测值比较
2013
Lin Ming, Fujian Agriculture and Forestry University, Fuzhou (China),College of Material Science and Engineering | Xie Yongqun, Fujian Agriculture and Forestry University, Fuzhou (China),College of Material Science and Engineering | Rao Jiuping, Fujian Agriculture and Forestry University, Fuzhou (China),College of Material Science and Engineering
Chinese. 将木材的生物细胞结构作为一级近似简化为一个中空的细长方匣子模型。根据类比推理原理,把木材的导热与导电类比,从中推导出木材横纹导热系数的理论表达式,进而应用数学分析方法从该理论表达式中提示出木材横纹导热系数是木材孔隙率的减函数;对含水率相同的木材,密度大者,导热系数大;以及同一种木材,导热系数随其含水率增大而增大的规律。最后以27种木材的试验数据对导热系数理论表达式及得出的所有结论进行验证。
Show more [+] Less [-]English. Cell shape was modeled as a rectangular casket with a thin and long hollow from the cell structure of wood biologically. Theoretical expression of wood thermal conductivity in transverse direction was derived by the analogism, i.e. drawing an analogy between heat conduction of the material and its electric conduction. Then, the rules were revealed from this expression by applying mathematical analysis that： wood thermal conductivity in transverse direction was a decreasing function of wood porosity; for the wood having the same moisture content, the thermal conductivity increased with the increase of density; for the same wood, the thermal conductivity in creased because of higher moisture content. Finally, theoretical expression of wood thermal conductivity in transverse dirction and all conclusions drawn in this paper were verified by testing data of wood thermal conductivity in transverse direction of 27 tree species of wood.
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