植物多孔介质快速干燥过程微细结构变化的分形特征及对热质传递影响机制

项目名称： 植物多孔介质快速干燥过程微细结构变化的分形特征及对热质传递影响机制

项目编号： No.51306213

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 朱文魁

作者单位： 中国烟草总公司郑州烟草研究院

项目金额： 25万元

中文摘要： 多孔材料干燥过程收缩形变现象普遍存在，尤其对片基植物材料等典型可变形多孔介质的快速干燥过程。收缩形变导致的多孔介质内部孔隙尺度上微细结构变化，同时又影响着干燥热湿传递过程。对干燥过程介质的微细结构变化特征及与热质传递间的相互影响，目前关注较少。对此问题的深入探讨，有助于完善和发展可变形多孔介质干燥理论。本课题拟针对片基植物多孔介质，通过显微CT成像等微观测试手段，结合分形几何分析方法，研究快速干燥过程中介质微细结构变化规律及分形特征；通过建立考虑微细结构特征的干燥模型，将模拟分析与试验相结合，研究阐明干燥过程多孔材料微细结构特征变化对热质传递的影响机制，为可变形多孔介质干燥理论完善发展提供重要支持，并为该类多孔介质干燥过程优化传热传质提供基础支撑。

中文关键词： 植物多孔介质；快速干燥；微细结构；热质传递；干燥模型

英文摘要： The drying shrinkage characteristics is general for porous materials, especially for the rapid drying process of typical deformable porous media such as plant leaves. The drying shrinkage of porous materials resulted in significant variation of microstructure, which in turn influence heat and mass transfer of drying process. Now, few study works pay attention to the interaction between microstructure variation and heat and mass transfer. Exploration on this problem is helpful for the drying theory development on deformable porous media. The present work will investigate the regularity variation of porous medium microstructure and its fractal features,by using microscopic image measurement and fractal method. Furtherly, by developing a drying model involving the microstructure characteristics of porous media, the study will combine model analysis with experiment to illuminate the effects mechanism of microstructure change on heat and mass transfer during drying process. The study not only has theoretical significance, but also can supply technical foundation for optimization of drying process.

英文关键词： plant porous media；fast drying；microstructure；heat and mass transfer；drying model