基于分形理论的马铃薯干燥过程水分输运特征分析

Analysis of Moisture Transport Characteristics during Potato Drying Process Based on Fractal Theory

摘要:

基于马铃薯内部结构的异质性和分布随机性，利用分形特性模拟了在干燥过程中的水分输运过程。结果发现结合收缩和分形现象的模型呈无收缩现象连续介质模型更接近实验值，且分形模型的内部压力分布没有出现像连续模型呈比例逐层下降的现象。包括收缩的分形模型与孔的连通性、孔隙率、面积分形维数和孔最小最大直径比值成正比，与迂曲分形维数和迂曲度成反比。

Abstract:

For the heterogeneity and random distribution in potato internal structure, the water transport process during drying was simulated by using fractal characteristics. The result showed that the model combined with shrinkage and fractal was more close to the experimental data than no shrinkage and continuum model, and the internal pressure distribution did not fall step by step in proportion as continuous model. The fractal model including shrinkage increased with pore connectivity, porosity, area fractal dimension and the ratio of the minimum and maximum pore diameters, whereas it decreased with tortuosity fractal dimension and pore tortuosity.