热风干燥细胞尺度水分传输及收缩数值模拟

Numerical Simulation of Coupled Water Transport and Shrinkage Deformation of Cellular Tissues During Hot-Air Drying

目前植物物料热风干燥过程中品质变化机理未得到充分地研究,原因之一是对细胞尺度上干燥特性认识不足。本文基于模型细胞,针对细胞中不同的结构建立水分传输模型,并建立力学模型模拟细胞失水过程中的收缩现象,实现热风干燥过程植物细胞尺度上的水分传输和收缩变形的模拟。通过与文献结果对比验证了本文模拟结果的正确性,分析了植物细胞中不同结构在水分传输和失水收缩过程的规律,以及细胞收缩变形对其水分传输的影响,为从细胞尺度分析物料的干燥特性打下基础。

Insufficient knowledge of water transport from cellular tissues has been one of the rea-sons for the lack of full investigation on the plant material property variation mechanism during the drying process.Based on model cells,a water transport model was established for different struc-tures in the cells,and a mechanical model was built to simulate the shrinkage in the dehydration process.The proposed models were validated by comparing the results with those in literature.The isothermal drying process of cellular tissues was numerically simulated.Water transport and shrink-age due to dehydration were investigated for different structures in the cells.Besides,the influence of shrinkage deformation on water transport in the drying process was analyzed,which provided significant foundation for investigating drying characteristics of materials from the cellular tissues.