A high-temperature drying model for softwood timber

被引：51

作者：

Nijdam, JJ

Langrish, TAG

Keey, RB

机构：

[1] Univ Canterbury, Wood Technol Res Ctr, Christchurch 1, New Zealand

[2] Univ Sydney, Dept Chem Engn, Sydney, NSW 2006, Australia

来源：

CHEMICAL ENGINEERING SCIENCE | 2000年 / 55卷 / 18期

关键词：

drying; heat transfer; mass transfer; mathematical modelling; porous media; softwood;

D O I：

10.1016/S0009-2509(00)00042-7

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The high-temperature drying of a softwood board with relatively high permeability was modelled on a one-dimensional basis. The moisture-transport mechanism between fibre saturation and irreducible saturation was elucidated, and moisture flow within the thin layer of damaged cells at the sawn surfaces of the timber board was examined. The predicted temperature and average moisture-content profiles with respect to time were in good agreement with some experimental data from the literature. Comparison between the experimental and predicted within-board moisture-content profiles illustrated the importance of accounting for the orientation of the growth rings with respect to the drying surfaces and the effect of density variations on liquid permeability at high core moisture contents. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：3585 / 3598

页数：14

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