规整填料表面液体分布的计算流体力学.pdf

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化工进展
2015年第34卷第9期
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
3221
研究开发》
Mass
规整填料表面液体分布的计算流体力
谭丽媛',袁希钢', KALBASSI Mohammad Ali'
(天津大学化学工程联合国家重点实验室,天津300072:;2 Air Products Public Limited Company, Walton on
Thames, UK)
摘要:采用计算流体力学( computational fluid dynamics,CFD)中的VOF方法对规整填料表面液相分布进行了
三维建模和仿真,实现规整填料内液相分布的可视化并得到了液膜厚度和有效相界面积比等相关定量信息。通
过分析比较不同物系的数值模拟结果,发现液体的表面张力和黏度都对填料表面上液体分布有影响。表面张力
越小,液相在填料片上分布越均匀,有效相界面积比越大,液膜厚度越小;黏度増加,有效相界面积比和液膜
厚度也随之增加。较之于黏度对液相分布的影响程度,表面张力的影响程度更大,为主要影响因素。本文还提
出一个预测有效相界面积比的新公式,并将数値模拟结果与已有文献进行对比,吻合性较好
关键词:计算流体力学;可视化;液膜厚度;有效相界面积比;表面张力;黏度
中图分类号:TQ028
文献标志码:A
文章编号:1000-6613(2015)09-3221-12
DOI:10.16085/ ].issn.1000-6613.2015.09.003
Computational fluid dynamics study of liquid distribution on structured
packing surface
TAN Liyuan, YUAN Xigang, KALBASSI Mohammad Al?
( State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China; Air Products Public
Limited Company, Walton on Thames, UK)
Abstract: A volume of fluid(OF)model of the computational fluid dynamics(CFD )method was
used to simulate the liquid distribution on the structured packing surface. 3D simulation visualized
liquid distribution. The results were used to estimate liquid film thickness and effective interfacial area
atio on the structured packing surface quantitatively, and the results were validated with existing
correlations in the literature. Different systems with different surface tension values were used in the
simulation and the effect of both surface tension and viscosity of liquid phase on liquid distribution
were examined. Based on the simulation a new equation to predict the effective interfacial area ratio
was proposed. The simulation results showed that the CFD method can be used as an effective tool to
provide information on the details of the gas and liquid flows in complex packing geometries
Key words: computational fluid dynamics(CFD); visualization; liquid film thickness; effective
interfacial area ratio; surface tension; viscosity
规整填料塔因在汽提和吸收过程中为气液两相相即使是在初始时就分布不均匀,也不会对塔的分
提供有效的接触面而被广泛应用于工业生产中,其离效率有影响。因此规整填料表面液相分布的研究
分离效率的预测和提高一直以来都是研究人员最为
关注的问题。 Mohamed等叫在对气液相在规整填料收稿日期:,205020,修改稿日期,20150420
塔内分布的研究中发现,液体在规整填料塔内的不
第一作者:谭丽媛(1989-),女,硕士研究生,从事化工分离的研究
联系人:袁希钢,教授,从事化工传质分离及化工系统工程研究。E-~mail
均匀性分布是影响塔分离效率的决定性因素,而气
anxg@ju.edu.cn。