摘要
微波能作为清洁可再生能源,应用在介电材料热过程时与传统加热方式相比具有高效、均匀、快速等优势.文中建立了基于多物理场耦合的理论三维数学模型,描述了含水介电材料间歇微波热过程.随着间歇微波热处理的进行,介电材料内的平均电场模增加,电场强度分布均匀性变好;平均温度增加,温度分布均匀性先变差然后趋于稳定;平均含水率减小,含水率分布均匀性变差,但含水率变异系数极低,因此,介电材料内水分分布均匀.此外,随着环境相对湿度或压力的增加,介电材料内部平均电场模减小,电场强度分布均匀性变差;平均温度增加,温度分布均匀性变好;平均含水率增加,含水率分布均匀性变好.比较环境相对湿度和压力对模拟结果的影响可知,环境压力对介电材料内电场强度和含水率的影响更为显著.
Asa clean and renewable energy,microwave has advantages of high efficiency,uniformity and speed compared with the traditional heating methods in the thermal process of dielectric materials. In this paper,a theoretical three-dimensional mathematical model based on multi-physics is established to describe the intermittent microwave thermal process of hydrous dielectric materials. With the progress of intermittent microwave heat treatment,the average electric field in the dielectric material increased,and the distribution uniformity of electric field intensity became better;the average temperature increased,the uniformity of temperature distribution became worse firstly and then became stable;the average water content decreased,the uniformity of water content distribution became worse,but the water content in the dielectric material was uniform due to the low variation coefficient of water content. In addition,with the increase of environmental relative humidity or pressure,the average electric field mode in the dielectric material decreased,and the distribution uniformity of electric field intensity became worse;the uniformity of temperature distribution became better,and the average temperature increased;the average water content increased,and the distribution uniformity of water content became better. Compared with the influence of environmental relative humidity and pressure on the simulation results,it can be seen that the influence of environmental pressure on the electric field intensity and water content in the dielectric material is more significant.
作者
苏天一
张志军
Su Tianyi;Zhang Zhijun(School of Mechanical Engineering and Automation,Northeastern University,Shenyang Liaoning 110004)
出处
《东北电力大学学报》
2021年第5期9-21,共13页
Journal of Northeast Electric Power University
基金
国家自然科学基金(31371873,31000665,51176027,31300408)。
关键词
间歇微波热过程
多孔介电材料
三维数学模型
耦合模拟
Intermittent microwave thermal process
Porous dielectric materials
Three dimensional mathematical model
Coupling simulation
