木材干燥过程热质迁移数学模型研究现状

建立及求解木材干燥过程热质迁移数学模型的主要目的是为了对木材实际干燥过程进行预测和控制,对促进木材干燥技术的发展意义重大。本文主要从水分迁移、能量转移、应力应变与数值求解方法等方面,归纳总结了国内外木材干燥过程中热质迁移模型建立及求解的研究现状,根据木材干燥机理、热质迁移理论及干燥生产实际分析了模型可借鉴应用之处以及存在的问题,提出符合实际干燥情况的多维(2、3D)热质迁移以及考虑木材干缩现象的热质-应力应变耦合数学模型是今后的研究重点。 

Present status of research on mathematical models of heat and mass transfer during wood drying

The main objectives of developing and solving mathematical models of heat and mass transfer are to easily anticipate and control the drying process, and to promote the development of wood drying technology. This paper summarizes the domestic and abroad status of the research on establishment and solution of heat and mass transfer models in terms of mass transport, heat transfer, stress-strain and numerical solution method. According to the mechanism of wood drying, theory of heat and mass transfer and reality of drying production, we discuss the applications of the models and the problems existing in them. We suggest that future research could be focused on heat and mass transfer models that take into account real drying conditions, multi-dimensions ( 2/3D ) and coupled stress-strain considering shrinkage.