木材干燥导水系数和换水系数的研究

木材(板、方材)的导水系数和换水系数是反映木材干燥或存放过程中水分迁移的重要物性参数。然而,我国对木材导水系数和换水系数的研究和测定工作十分有限。木材干燥有关的理论计算中,常用原苏联的数据。由于这些数据本身可能存在的误差及用于我国树种的可靠程度难以估计,故使理论结果的实际运用受到限制。本文采用等厚试件系数分离法研究和测定了木材干燥过程动态导水系数和换水系数。

STUDY ON THE DIFFUSION COEFFICIENT AND THE SURFACE EMISSION COEFFICIENT OF WOOD DRYING

The diffusion coefficient D and the surace emission coefficient S are the essential physical parameters characterizing the water transport in lumber drying and storage. By using the separating method from a single drying ourve of wood specimens (Fraxinus mandshurica) in the same thickness, the time-variation parameters D and S were obtained in the study.The experiment visualized that both D and S were dependent on the moisture content of wood. The method suggested in the paper is easy in experiment and can obtain satisfactory results. Therefore, the method has the potential of applications in research and practical engineering problems.