CFD simulations of liquid side local mass transfer characteristics and enhancement in capillaries under Taylor flow

许闽

doi:10.3969/j.issn.0438-1157.2012.01.006

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CFD simulations of liquid side local mass transfer characteristics and enhancement in capillaries under Taylor flow

更新时间：2025-12-10

- CFD simulations of liquid side local mass transfer characteristics and enhancement in capillaries under Taylor flow
- CIESC Journal Issue 1, Pages: 42-50(2012)
- 作者机构：
  
  北京化工大学化工资源有效利用国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.01.006
  CLC： Q021.4
- Online First：05 January 2012，
  
  Published：05 January 2012
- 稿件说明：
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许闽. CFD simulations of liquid side local mass transfer characteristics and enhancement in capillaries under Taylor flow[J]. CIESC Journal, 2012, (1): 42-50.
DOI：

许闽. CFD simulations of liquid side local mass transfer characteristics and enhancement in capillaries under Taylor flow[J]. CIESC Journal, 2012, (1): 42-50. DOI： 10.3969/j.issn.0438-1157.2012.01.006.

摘要

采用计算流体力学（CFD）的方法，研究了圆管中泰勒流的液侧传质特性，分析了泰勒气泡上局部传质特性，并研究了气泡上升速度、液膜长度和液栓长度对液膜处和气泡半球帽处平均传质系数的影响。结果表明，泰勒气泡表面局部传质系数存在3个峰值，液膜处的平均传质系数随气泡上升速度增大显著增大，随液膜长度增大而减小，而半球帽处的平均传质系数随气泡速度和液膜长度的增大变化较小，即膜接触时间增加时，液膜处的传质系数降低，而半球帽处传质系数变化较小。另外，引入场协同原则对单元胞内速度场和浓度场进行分析，解释了局部传质特性及强化机理。最后，给出了分别预测短和长膜接触时间下泰勒流液侧体积传质系数的关联式，该式在较宽的管径尺度范围（0.25～3 mm）内的预测误差在±20%以内。

Abstract

The characteristics of liquid side mass transfer under Taylor flow in capillaries were studied by performing computational fluid dynamics(CFD) simulations.The local mass transfer coefficients on bubble surface were evaluated

and the effects of bubble rise velocity

length of liquid film and slug length on the mean mass transfer coefficients of liquid film and the two caps were investigated.Three peak values of local mass transfer coefficient were found on bubble surface.The average mass transfer coefficient of liquid film increases with the increase of bubble rise velocity and decrease of liquid film length

whereas the average mass transfer coefficient of the two caps varies less.Mass transfer coefficient in liquid film decreases as the film contact time increases

while that in the caps changes less.Moreover

the principle of field synergy was used to explain the characteristics and enhancement of local mass transfer.The coordination between the velocity and concentration fields was better near the liquid film and two bubble caps.The results show that short film contact time for the same contact area could enhance the gas-liquid mass transfer under Taylor flow.Finally

empirical correlations were proposed to predict the liquid side volumetric mass transfer coefficients for short and long film contact time separately

and the predicted values in capillaries with diameters of 0.25—3 mm have a relative error within ±20%.

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