MODELING OF THE DRYING PROCESS OF WOOD IN 3-DIMENSIONS

被引：11

作者：

MOUNJI, H

ELKOUALI, M

BOUZON, J

VERGNAUD, JM

机构：

[1] Laboratory of Materials and Chemical Engineering, Faculty of sciences, University of ST Etienne, Saint-Etienne, 42100

来源：

DRYING TECHNOLOGY | 1991年 / 9卷 / 05期

关键词：

MODELING; WOOD; DRYING PROCESS; 3-DIMENSIONAL DIFFUSION; EVAPORATION; MC ABOVE THE FSP;

D O I：

10.1080/07373939108916751

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The process of drying parallelepipedic samples of wood is studied, by considering 3-dimensional transport of water along the 3 principal axes of diffusion, as well as evaporation out of the surface. During a large part of the process, the water content is considerably higher than the value associated with the fiber saturation point. A numerical model with finite differences, based on the assumption that the transport of water is controlled by transient diffusion through the sample and evaporation from the surface, is successfully tested with a beam in the following two cases: the initial concentration of water is uniform, or not. The model is capable of predicting not only the kinetics of drying, but also the profiles of concentration developed through the samples at various times. The principal diffusivities are determined by using a short test technique in transient condition.

引用

页码：1295 / 1314

页数：20

共 22 条

[1] Bramhall G., Fick's Law and bound water diffusion, Wood sci, 8, pp. 153-160, (1976)
[2] Stamm A.J., Bound-water diffusion into wood in the fiber direction, Forest Prod. J., 9, pp. 27-32, (1959)
[3] Stamm A.J., Combined bound water and vapor diffusion into stika spruce, Forest Prod. J., 12, pp. 644-648, (1960)
[4] Skaar C., Moisture movement in beech below the fiber saturation point, Forest Prod. J., 8, pp. 352-357, (1958)
[5] Choong E.T., Diffusion coefficients of softwoods by steady state and theoretical methods, Forest Prod. J., 15, pp. 21-27, (1965)
[6] Moschler W.W., Martin R.E., Diffusion equation solutions in experimental wood drying, Wood Sci., 1, pp. 47-57, (1988)
[7] Comstock G.L., Moisture diffusion coefficients in wood as calculated from absorption, desorption, and steady state data. J., 3, pp. 97-103, (1963)
[8] Siau J.F., Flow in wood, (1971)
[9] Avramidis S., Siau J.F., An investigation of the external and internal resistance to moisture diffusion in wood, Wood Sci. Technol., 21, pp. 249-256, (1987)
[10] Droin A., Taverdet J.L., Vergnaud J.M., Modelling the kinetics of moisture absorption by wood, Wood Sci. Technol., 22, pp. 11-20, (1988)

← 1 2 3 →