基于COMSOL的纸浆模塑干燥模拟及验证

Simulation and Verification of Molded Pulp Drying by Software COMSOL

目的研究采用COMSOL Multiphysics模拟纸浆模塑干燥效率及厚度变化的可行性。方法基于多孔介质理论,应用有限元仿真软件COMSOL Multiphysics建立纸浆模塑干基含水率随时间变化的热湿、水分流动、非等温流动多物理场耦合模型,考虑干燥中含湿多孔介质的湿空气热对流及多孔基体的热传导,模拟在热板加热条件下纸浆模塑的干燥效率和厚度的变化,并与实验结果进行比较。结果模型内域探针所得模拟结果与实验结果具有良好的一致性,在干燥后期厚度预测误差范围为0.4%~7.7%,干燥效率预测差异值最低为4.3%。结论采用COMSOL Multiphysics模拟纸浆模塑干燥过程可行。

The work aims to study the feasibility of using COMSOL Multiphysics to simulate the drying efficiency and thickness of molded pulp products.Based on the theory of porous media,the finite element simulation software COMSOL Multiphysics was used to establish the multi-physical field coupling model of heat and humidity,water flow and non-isothermal flow of dry base moisture content of pulp molded with time.Considering the heat convection of wet air in wet porous media and the heat conduction of porous matrix during drying,the drying efficiency and thickness of molded pulp under hot plate heating were simulated and compared with the experimental results.The simulation results obtained by the inner domain probe of the model were in good agreement with the experimental results,the error range of thickness prediction in the later stage of drying was 0.4%-7.7%,and the difference of drying efficiency prediction was as low as 4.3%.It is feasible to use COMSOL Multiphysics to simulate the drying process of molded pulp.