木材热导率内在规律的理论研究

Inherent Law of Wood Thermal Conductivity

依据导热与导电宏观规律的相似性,应用类比推导出木材径向热导率是孔隙率函数的数学表达式 孔隙率越大,热导率越小 这一结论无论与机理分析、或是与实验验证都是一致的 应用该表达式计算出20种木材径向热导率,理论值最大误差不超过12%。

Mathematical expression of wood thermal conductivity was derived by analogism from the analogy between heat and electric conduction.The expressions point to the conclusion that wood radial thermal conductivity is a function of the rate of small opening in wood.The greater the rate of small opening in wood,the smaller the thermal conductivity.The conclusion is identical with mechanism analysis or test and verification.With the formula derived, the theoretical values of thermal conductivity for 20 tree species were calculated.The maximum error is 12.8% and average error less than 5%.