Determination of the mass diffusion coefficient of wood by thin-layer drying kinetics
¹Latvia University of Life Sciences and Technology, Institute of Agricultural Machinery, Cakstes blvd.5, LV–3001 Jelgava, Latvia
²Czech University of Life Sciences Prague, Faculty of Engineering, Kamycka 129, CZ165 21 Prague 6, Czech Republic
The aim of this paper is to present the method of using thin layer drying under controlled conditions, to obtain variable moisture diffusion coefficient expression of wood drying. The obtained relationship parameters can then be used for a larger sample drying process simulation. This paper includes the theoretical study of changes of moisture content determination in wood in response to high temperature of the drying air (105 °C). A 1-D diffusion model with a variable concentration-dependent diffusion coefficient is considered. This problem is solved, using the differential scheme. Paper described theory and experimental results of wood drying by the high temperature at 105 °C. For studies have selected five types of wood: oak (Quercus robur), beech (Fagus silvatica), spruce (Picea abies), scots pine (Pinus silvestris), and larch (Larix decidua). Experimental measurements and modelling results are given.