Abstract: 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.

Key words: Separating method, Diffusion coefficient, Surface emission coefficient