摘要
基于多物理场耦合理论,采用动网格方法建立了热风–极片湿涂层传热传质动态干燥模型。为提高计算效率,对干燥模型进行无网格并行简化,模型结果与文献数据误差在±15%内,模型具有可靠性。基于该模型,本文研究了不同运行参数对运动干燥过程中湿涂层传热传质特性的影响规律。结果表明,湿涂层的液膜厚度(LFT)随干燥时间的增加线性减小,其减小速率随热风速度的增大和温度的升高而显著增大;孔隙排空速率(PER)随干燥时间先增大后减小,其最值随热风速度的增大和温度的升高而增大。基于上述结果,本文对比研究了热风速度和温度对湿涂层不同分区干燥均匀性的影响。结果表明,与提高热风温度相比,提高热风速度对改善湿涂层干燥均匀性有更好的效果。
A dynamic drying model of heat and mass transfer characteristics for wet coating is established during drying process of hot wind based on multiphysics coupling theory and dynamic mesh methods.The drying model is simplified parallelly to increase computational efficiency and then proved accuracy because its error range is±15%through research data.Based on the model,the variations of heat and mass transfer characteristics are analyzed for wet coating under different operating parameters during drying process of hot wind.It can be found that with the increase of drying time,the liquid film thickness(LFT)decreases,and its reduction gradient increases with the increase of velocity and temperature significantly.Meanwhile,the pore emptying rate(PER)increases first and then decreases,and its maximum increases with the increase of velocity and temperature significantly.The relative humidity has little impact on drying characteristics of wet coating.Through the above analysis,the drying uniformity of different segmentations is analyzed and compared for wet coating under different operating parameters.Compared with increasing the temperature of hot wind,increasing its velocity has a better effect on improving the drying uniformity of wet coating.
作者
王佳骏
曾月
麻宏强
丁瑞祥
WANG Jiajun;ZENG Yue;MA Hongqiang;DING Ruixiang(School of civil engineering and architecture,East China Jiaotong University,Nanchang 330013,China;College of pipeline and civil engineering,China University of Petroleum(East China),Qingdao,266580,China)
出处
《工程热物理学报》
北大核心
2026年第1期189-199,共11页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.52368071)
江西省创新领军人才项目(No.jxsq2023101064)
江西省创新领军人才项目(No.jxsq2023102132)
研究生创新资金项目(No.YC2023-S486)。
关键词
湿涂层传热传质动态干燥模型
动态仿真
传热
传质
干燥
计算流体力学
dynamic drying model of heat and mass transfer for wet coating
dynamic simulation
heat transfer
mass transfer
drying
computational fluid dynamics
