基于三维实体模型的玉米热风干燥模拟计算

针对热风干燥条件下单体玉米颗粒内部的传热传质过程，开展基于三维实体模型的模拟研究.借助高精度医用CT机扫描玉米颗粒，所获得的CT图片经过MIMICS和ANSYS软件处理，建立玉米颗粒的三维实体模型.采用傅里叶传热方程、菲克扩散方程以及导热系数、扩散系数公式作为干燥理论模型的控制方程；利用COMSOLMultiphysics计算软件完成模拟计算.模拟结果表明，热风干燥过程中玉米颗粒内部为传质控制过程，所提三维实体模型模拟计算方法能够更好地描述单体谷物颗粒内部的热质传递现象.

Simulation of Hot Air Drying on Corn Grains Based on the Three Dimension Entity Model

Based on the three dimensional entity model， the simulation of interior heat and mass transfer process in a single corn grain under the conditions of hot air drying was carried out. The corn grain was scanned by high precision medical CT machine. The CT images were processed with MIMICS and ANSYS to construct the corn kernel’s three dimension entity model. The Fourier heat conduction equation， the Fick diffusion equation， the heat transfer coefficient and mass diffusion coefficient formula were chosen as the governing equations of dry theoretical model. COMSOL Multiphysics was used to complete the simulation calculation. The results showed that the mass transfer is dominant in the corn kernel hot air drying. The simulation method based on the three dimension entity model can describe the interior heat and mass transfer phenomenon more accurately in the single grain.