薄层介质干燥过程内部水分扩散

Moisture Diffusion from Thin Layer Media during Drying Process

以海带作为薄层介质的试样 ,进行对流干燥实验 .根据单项指数模型 ,计算干燥过程中介质内部水分的有效扩散系数 .建立物料内水分扩散微分方程及边界条件 ,用有限差分法进行数值求解 ,模拟计算结果与实验结果相吻合 .研究结果有利于深入分析和理解物料的干燥特性 。

Taking laminaria japonica as the sample of thin layer media, experiment of drying by convection is carried out. Effective diffusion coefficient of moisture inside the media during drying process is calculated according to single exponential model. Differential equation and boundary condition of diffusion of moisture of matter are established and solved numerically by the method of finite difference. The results of analog calculation coincide with results of experiment. These results are advantageous to the deepgoing analysis and understanding of the characteristic of drying of matter and water separation capability under certain condition.