【摘要】 本文建立了描述木片热湿耦合迁移的数学模型。用数值方法(有限元法和有限差分法)对数学模型联立求解后。与实验相结合,分析计算了木片热湿耦合迁移的物性参数。研究表明,在确定了某些物性参数后,采用本文叙述的理论计算与实验结合的方法,可求算出某一未知或实验测定较为困难的物性参数。木片这种含湿多孔物料。有效导热系数均随温度的上升而增大,变化范围从10℃(含水率34％)时的0.2W/(m·℃)至47℃时的1W/(m·℃)。更多还原

【Abstract】 The mathematic models which governed the transient process of coupled heat and mass transfer of wood particle material were established in the study. In combination with experiment, the variable thermophysical parameters in the governing equations were analysed by using numberial method(finite element method and finite difference method). The paper demonstrated that one of the above mentioned parameters, which was difficult to measure in such a complicated process, could be determined by using the method given in the paper. The result showed that the effective heat conductivity of wood particle material got larger as the temperature increased. The values of the effective heat conductivity ranged from 0.2w/m℃(temperature 10℃ and moisture content 43％) to 1w/m℃(temperature 47℃).更多还原