摘要
通过对降膜分子蒸馏器蒸发表面上液膜流动和传质传热的分析,建立了液膜的传质和传热方程;并在单组分非线性BGK方程的基础上,建立了描述多组分稀薄气体流动的非线性BGK模型方程。通过适当的边界条件将液膜方程和气体方程耦合在一起,得到了降膜分子蒸馏过程的传质与传热数学模型。该模型揭示了液膜温度和浓度在径向和轴向上的变化规律以及气相空间气体的密度、温度和速度的变化规律,适用于恒壁温和绝热壁等不同操作情况。
On the basis of analysis of liquid flow, mass transfer and heat transfer as well as the new scheme for multi-component flow calculations between two closed surfaces of evaporation and condensation, a new mathematic model is developed to describe falling-film molecular distillation process. This model can be used to calculate the profiles of temperature and concentration of film and the profiles of density, temperature and velocity of vapor with the consideration of the feed rate, evaporation temperature and inert gas pressure. The model is applicable to simulate the evaporator with a constant wall temperature or with insulated wall.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2004年第5期558-563,共6页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金资助项目(20136010)。
关键词
降膜分子蒸馏器
数值模拟
分子蒸馏
BGK方程
Computer simulation
Evaporators
Flow of fluids
Heat transfer
Mass transfer
Mathematical models
Molecular dynamics
