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该文根据非平衡态热力学和相平衡理论,建立了多孔介质对流干燥内部传热传质过程的二维数学模型,该模型充分考虑了传热与传质之间的相互耦合,用控制容积积分法采用全隐格式对该模型进行分析求解,并与玉米干燥实验数据进行对比。结果表明,表面对流换热系数、干燥介质温度和湿度的变化对热、湿迁移过程均有较大影响,而表面对流传质系数对湿迁移过程影响不大,温度和湿度梯度的耦合产生“局部增湿”现象。
According to the theory of non-equilibrium thermodynamics and phase equilibrium, a two-dimensional mathematical model of heat and mass transfer in convective drying of porous media is established. The model fully considers the mutual coupling between heat transfer and mass transfer, The method uses the full implicit format to analyze and solve the model, and compares it with experimental data of corn drying. The results show that the surface convection heat transfer coefficient and the change of drying medium temperature and humidity have a great influence on the heat and moisture migration processes, while the surface convection mass transfer coefficient has little effect on the wet migration process. The coupling of temperature and humidity gradient produces “Local humidification ” phenomenon.