摘要
提出了气液相际传质的推动力来源于界面不平衡的概念. 针对气体吸收过程, 以普遍化的化学势推动力方程为基础, 导出了在有传质通量存在下的两相界面处的浓度关系, 并针对不同情况进行了求解. 提出了一个反映液相侧动力学状况的量纲1数Yo , Yo 越大界面处两相越偏离平衡. 界面浓度是与Yo 和液相主体浓度密切相关的. 为验证本文模型, 作者采用显微激光全息干涉技术对甲醇、乙醇、正丙醇静止吸收CO2 时的界面浓度进行了测定, 实验结果表明了本文模型的正确性.
The concept of interfacial non-equilibrium during mass transfer between gas and liquid was presented to explain the mechanism of interfacial mass transfer in which the driving force of gas-liquid interphase mass transfer was considered coming from the non-equilibrium. Based on the general chemical potential driving force equation, a concentration correlation between two phases at interface was derived and solved at different bulk liquid concentrations in the absorption process. The computational results showed that the interfacial concentration of absorbed component on the liquid side was strongly affected by a dimensionless number YO and was also dependent on bulk concentration. The CO2 interfacial concentration on the liquid side in stationary absorption by pure methanol, ethanol and n-propanol absorbent respectively were measured by using micro laser holographic interference technique to validate the model proposed. The experimental values were in good agreement with the calculated ones.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2005年第4期574-578,共5页
CIESC Journal
基金
国家自然科学基金项目 (20176036)~~
关键词
界面
非平衡
激光全息
干涉技术
气液传质
界面浓度
Absorption
Concentration (process)
Holography
Interfacial energy
Mass transfer
Phase equilibria
