非稳态法测定马尾松扩散系数  

Determination of Moisture Diffusion Coefficient of Pinus Massoniana with Non-steady State Methods

作　　者：李梁[1] 李贤军[2] 张璧光[3] 

机构地区：[1]国家知识产权局专利局机械部,北京100086 [2]中南林业科技大学材料科学与工程学院,湖南长沙410004 [3]北京林业大学材料科学与技术学院,北京100083

出　　处：《干燥技术与设备》2009年第2期79-83,共5页

摘　　要：采用非稳态法在一定的实验条件下测定了马尾松的水分扩散系数,并且探讨了不同干燥介质温度、不同初含水率、不同纹理方向对扩散系数的影响。实验结果表明:干燥介质温度越高,扩散系数越大;初含水率越高,扩散系数也越大;木材纵向水分扩散系数远大于横向水分扩散系数,其比值介于5～7之间;径向水分扩散系数略大于弦向水分扩散系数,其比值约为1～1.5。Pinus massoniana was tested systematically in non-steady state conditions to determine the moisture diffusion coefficient when the temperature of the drying medium, the initial moisture content （IMC）, and the texture direction varied. Results showed that the moisture diffusion coefficient increased with the increase of the drying medium temperature or IMC, reaching a maximum near the fiber saturation point （ FSP）. The longitudinal diffusion coefficient was significantly larger than the transverse diffusion coefficients, with the ratio range of 5 to 7, and the radial diffusion coefficient was clearly larger than the tangential diffusion coefficient with a ratio of about 1-1.5.

关 键 词：水分扩散系数 马尾松 影响因素 

分 类 号：O552.3[理学—热学与物质分子运动论]