摘要
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。
In this paper, on the base of non-equilibrium thermodynamic theory and phase equilibrium principle, a two-dimension mathematical model for convective drying of porous media was established. In this model, the coupled heat and mass transfer phenomena was considered enough. The mathematical model for corn drying was established and the solution was gained by using integral method and implicit different scheme. Moreover, the simulated results were compared with experimental data. The results indicated that the coefficient of surface heat convection, the temperature and humidity of dried material affected the process of heat and mass transfer greatly. The coefficient of surface mass convection didn't affect the process of mass transfer. Furthermore, the coupling of temperature and humidity gradient induced the local humidity increase phenomena.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2005年第1期27-31,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
河北省热能重点学科干燥方向基金资助项目
关键词
非平衡热力学
多孔介质
对流干燥
数学模型
non-equilibrium thermodynamics
porous media
convective drying
mathematical model
