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为研究木材在不同相对湿度下吸湿过程含水率的变化,建立木材吸湿的动力学模型。用有限元差分方格法离散化方程,参照试验测得的浓度依赖性的扩散率和表面扩散系数,并利用matlab计算机软件进行求解。进行的两组试验不仅计算模型中的参数(结合水的扩散率、木材表面的吸湿系数),还对模型进行验证。吸湿试验分两部分研究,一是在木材的纵向上,将木材现在50%的相对湿度中达到平衡,再一步步提高相对湿度(50~58%,58~66%,66~74%,74~82%);二是分别提高相对湿度(50~58%,50~66%,50~74%,50~82%)做平行试验,测木材的吸湿量。结果显示试验测得的吸湿量和模型模拟出的结果具有很好的相关性,证明吸湿模型的可行性。
In order to study the moisture content of wood during moisture absorption under different relative humidity, a dynamic model of wood moisture absorption was established. The finite element difference square grid discretization equation was used to refer to the experimentally measured concentration-dependent diffusivity and surface diffusivity, and the matlab software was used to solve the problem. Two sets of experiments were conducted to calculate not only the parameters in the model (combined with the water diffusivity and the moisture absorption coefficient of the wood surface), but also the model. Moisture absorption test is divided into two parts, one is that in the vertical direction of the wood, the wood is balanced in the relative humidity of 50%, and then the relative humidity is increased step by step (50-58%, 58-66%, 66-74%, 74 ~ 82%); the second is to increase the relative humidity (50 ~ 58%, 50 ~ 66%, 50 ~ 74%, 50 ~ 82%) to do a parallel test to measure moisture absorption of wood. The results show that the measured moisture absorption and model simulation results have a good correlation to prove the feasibility of moisture absorption model.