桦木波动干燥过程中温度和水分扩散数值模拟  

Numerical Simulation of Temperature and Moisture Diffusion during Wave Drying of Birch

作　　者：姜新波[1] 宋靖 夏鹏 JIANG Xinbo;SONG Jing;XIA Peng(Forestry Machinery and Woodworking Engineering Technology Center,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林业机械与木工工程技术中心,哈尔滨150040

出　　处：《森林工程》2022年第1期34-41,51,共9页Forest Engineering

基　　金：国家自然科学基金(32001286)。

摘　　要：为对木材干燥过程中温度和含水率这2个参数进行分析,本文应用开源软件OpenFOAM进行理论建模,修改simple求解器,自定义边界条件;对比桦木干燥过程中温度和含水率的实验数据,验证所建立模型的准确性;依据所建立模型的分析结果,对厚为50~80 mm、初始含水率为25%的桦木板材的波动干燥工艺进行分析和对比,并针对厚为70 mm的桦木板材的波动干燥工艺进行优化。结果表明,所建立模型的数值计算结果与实验数据的平均误差均控制在5%以内;干燥过程中,随着相应桦木板层厚度的增加,板材含水率梯度模的大小呈递减趋势;对于厚为70 mm、初始含水率为25%的桦木板材适当提升波动干燥冷却阶段的温度,可以优化干燥工艺。For the analysis of the two parameters of temperature and moisture content in the process of wood drying,this paper used the open source software OpenFOAM for theoretical modeling,modified the simple solver and defined the boundary conditions.The accuracy of the model was verified by comparing the experimental data of temperature and moisture content during birch drying.According to the analysis results of the established model,the fluctuating drying process of birch plate with thickness of 50-80 mm and initial moisture content of 25%was analyzed and compared,and the fluctuating drying process of birch plate with thickness of 70 mm was optimized.The results showed that the average error between the numerical results of the model and the experimental data was controlled within 5%.During the drying process,with the increase of the thickness of the corresponding birch wood layer,the size of the moisture content gradient mold decreased.For birch board with thickness of 70 mm and initial moisture content of 25%,appropriately increasing the temperature in the cooling stage of fluctuating drying can optimize the drying process.

关 键 词：开源软件OpenFOAM 波动干燥 水分扩散 数值模拟 工艺优化 

分 类 号：S782.31[农业科学—木材科学与技术]