聚乙烯醇流延干燥成膜数值模拟研究

魏晓颖; 程宏; 李窈; 陈威

doi:10.11777/j.issn1000-3304.2024.24315

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聚乙烯醇流延干燥成膜数值模拟研究

研究论文 | 更新时间：2025-04-17

- 聚乙烯醇流延干燥成膜数值模拟研究
- Numerical Modeling of Solvent Evaporation in Poly(vinyl alcohol) Film Formation during Solution Casting
- 高分子学报 2025年页码：1-13
- 作者机构：
  
  1.中国科学技术大学近代力学系中国科学院材料力学行为与设计重点实验室合肥 230026
  2.中国科学技术大学核科学技术学院国家同步辐射实验室安徽省先进功能高分子薄膜工程实验室中国科学院软物质化学重点实验室合肥 230026
- 作者简介：
  
  [ "陈威，男，1989年生. 2011年本科毕业于中国科学技术大学，2016年年博士毕业于美国阿克伦大学，2016~2018年在同济大学开展博士后研究，2018年加入中国科学技术大学同步辐射实验室开展工作，2024年获国家基金委优秀青年基金资助. 主要研究方向是发展固体核磁共振和同步辐射原位技术研究高分子加工." ]
- 基金信息：
  
  国家自然科学基金(基金号 ┣52422302);U20A20256┫;安徽省自然科学基金(基金号 ┣2308085UM02);2408055UM001┫;合肥市科技重大专项“揭榜挂帅”项目(2022-SZD-005)
- DOI：10.11777/j.issn1000-3304.2024.24315
  中图分类号：
- CSTR：32057.14.GFZXB.2025.7358
- 收稿日期：2024-12-30，
  
  录用日期：2025-02-08，
  
  网络出版日期：2025-04-17，
- 稿件说明：
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魏晓颖, 程宏, 李窈, 陈威. 聚乙烯醇流延干燥成膜数值模拟研究. 高分子学报, doi: 10.11777/j.issn1000-3304.2024.24315

Wei, X. Y.; Cheng, H.; Li, Y.; Chen, W. Numerical modeling of solvent evaporation in poly(vinyl alcohol) film formation during solution casting. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2024.24315
魏晓颖, 程宏, 李窈, 陈威. 聚乙烯醇流延干燥成膜数值模拟研究. 高分子学报, doi: 10.11777/j.issn1000-3304.2024.24315 DOI： CSTR： 32057.14.GFZXB.2025.7358.

Wei, X. Y.; Cheng, H.; Li, Y.; Chen, W. Numerical modeling of solvent evaporation in poly(vinyl alcohol) film formation during solution casting. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2024.24315 DOI： CSTR： 32057.14.GFZXB.2025.7358.

摘要

利用COMSOL软件开展了风场、温度场和浓度场等多物理场耦合下的聚乙烯醇(Poly(vinyl alcohol)

PVA)水溶液在快速干燥阶段成膜机理研究. 结合菲克定律、自由体积理论与Flory-Huggins理论，建立了简化的流动-传热-传质多物理场耦合下薄膜干燥成型模型. 基于不同空气风速(1.5~2.5 m/s)下PVA水溶液干燥称重实验数据，修正了边界层理论计算的传质系数. 研究结果表明薄膜与空气接触面的压强值变化很小，由于热风干燥的佩克莱数(Pe)较大，PVA水溶液在快速干燥阶段的扩散过程由对流主导. 修正后的传质系数在中等风速下(2.0 m/s)最大，表明传质系数与风速之间存在非单调关系，这与多物理场对PVA成膜过程中结晶、玻璃化转变和凝胶化等相变行为及其在厚度方向结构与组分不均匀性密切相关. 本文实验和数值模拟揭示的多物理场对聚合物溶液干燥速率影响机制，可为工业上PVA偏光膜基膜湿法流延成膜工艺参数优化提供理论指导.

Abstract

In this study

the drying process of poly(vinyl alcohol) (PVA) aqueous solution under the coupled effects of wind field

temperature field

and concentration field was investigated using COMSOL software. A simplified multi-physics coupling model for flow

heat

and mass transfer was developed by integrating Fick's law

the free volume theory

and the Flory-Huggins theory. The mass transfer coefficient

initially calculated using boundary layer theory

was subsequently refined based on experimental data obtained from drying and weighing PVA aqueous solutions at varying air speeds (1.5-2.5 m/s). The findings reveal that the pressure at the interface between the film and the air undergoes minimal changes. This is attributed to the high Peclet number (Pe) calculated for hot air drying

indicating that the diffusion process of the PVA aqueous solution during the rapid drying phase is predominantly governed by convection. Furthermore

the modified mass transfer coefficient reaches its peak at an intermediate wind speed of 2.0 m/s

suggesting a nonmonotonic relationship between the mass transfer coefficient and wind speed. Through a combination of experimental methods and numerical simulations

this study elucidates the mechanism by which wind speed influences the drying rate of polymer solutions. The insights gained provide a valuable foundation for optimizing the operational conditions for the drying and film formation of PVA aqueous solutions in engineering applications.

关键词

Keywords

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