水浸纸张冷冻干燥过程的动力学建模及实验方案优化  

Modeling of freeze-drying kinetics of water-soaked paper and improved method for drying procedure

作　　者：刘禹豪 赵述敏[1] 史成宇 陈宇铭 肖子阳 蒋臣威 方爱平 冯俊 张修兴[2] 王小力[1] LIU Yuhao;ZHAO Shumin;SHI Chengyu;CHEN Yuming;XIAO Ziyang;JIANG Chenwei;FANG Aiping;FENG Jun;ZHANG Xiuxing;WANG Xiaoli(School of Physics,Xi’an Jiaotong University,Xi’an 710049,China;School of Physics and Electrical Engineering,Weinan Normal University,Weinan 714099,China)

机构地区：[1]西安交通大学物理学院,陕西西安710049 [2]渭南师范学院物理与电气工程学院,陕西渭南714099

出　　处：《物理实验》2025年第3期48-56,共9页Physics Experimentation

基　　金：西安交通大学2023年基层教师教学发展组织建设项目(No.2302JF-01);2023年基层教学组织教学改革研究专项(基础课程);渭南师范学院教育科学研究项目(No.2020JYKX021)。

摘　　要：建立了基于边界层理论的纸张冷冻干燥动力学模型,探究了影响纸张冻干速率和冻干效果的物理因素.通过引入相态转变对水分子分布的影响,使模型能够很好地适应冷冻干燥过程中的低温情况.研究发现:在干燥过程中低温速冻后的纸张能够更加均匀稳定地汽化,这是冷冻干燥相比其他干燥方式更能保持纸张质量的关键;改变速冻过程中对纸张施加的压力并未对纸张平整度产生显著影响;在冷冻干燥后期升高温度难以避免水汽凝结带来的二次浸湿,对提升干燥速率没有明显效果.To describe the freeze-drying process of water-soaked paper more accurately,a kinetic model based on boundary layer theory was developed,and the physical factors influencing the freeze-drying rate and effectiveness were studied.By considering phase transitions on the distribution of water molecules,the model was effectively adapted to the low-temperature conditions encountered during freeze-drying.Results showed that the low-temperature frozen water-soaked paper could be uniformly vaporized,which was key to maintaining paper quality,and also the advantage of freeze-drying over other drying methods.During the freeze-drying process,applying pressure did not significantly affect the flatness of the paper.Increasing the temperature in the later stage of freeze-drying made it difficult to avoid secondary wetting caused by water vapor condensation,which was not significantly helpful for improving the drying rate.

关 键 词：水浸纸张 冷冻干燥 相变 边界层理论 动力学建模 

分 类 号：O551.1[理学—热学与物质分子运动论]