Measurements of Moisture Transport Coefficients in Wood during Drying. PaperPresented at the International IUFRO Wood Drying Conference (5th). Held in Quebec City, Canada on August 13-17, 1997

摘要

When making new drying models there is always a problem with getting goodmoisture transport properties such as diffusion coefficients. Very often there are problems with finding accurate values in the literature, and to make new measurements can be both difficult and expensive. The drying models are never better then the physical property values that are used. This work has concentrated on performing good experiments that can be evaluated with different methods. The measurements can be used for verifying existing drying models or for the evaluation of moisture transport coefficients. In this present work moisture gradients measurements have been performed in Scots pine (Pinus silvestris). These measurements were done with the moisture flow in three different directions to grain, radial, tangential and longitudinal. Further, the moisture transport coefficients were evaluated in all three directions to grain. At the end we discuss some possible explanations to the difference between our measurements and calculations of the surface emission coefficient.