Bubble and frictional characteristics of gas-liquid Taylor flow in capillary tube

ZHANG Jingzhi; LI Wei

doi:10.11949/j.issn.0438-1157.20141622

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Bubble and frictional characteristics of gas-liquid Taylor flow in capillary tube

更新时间：2025-12-10

- Bubble and frictional characteristics of gas-liquid Taylor flow in capillary tube
- CIESC Journal Issue 3, Pages: 942-948(2015)
- 作者机构：
  
  1. 浙江大学能源工程学院,浙江,杭州,310027
  2. 浙江大学能源工程学院, 先进航空发动机协同创新中心,浙江,杭州,310027
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141622
  CLC： K124
- Online First：05 March 2015，
  
  Published：05 March 2015
- 稿件说明：
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ZHANG Jingzhi, LI Wei. Bubble and frictional characteristics of gas-liquid Taylor flow in capillary tube[J]. CIESC Journal, 2015, (3): 942-948.
DOI：

ZHANG Jingzhi, LI Wei. Bubble and frictional characteristics of gas-liquid Taylor flow in capillary tube[J]. CIESC Journal, 2015, (3): 942-948. DOI： 10.11949/j.issn.0438-1157.20141622.

摘要

采用相对坐标系方法

研究毛细管(d 2mm)内充分发展垂直上升气液Taylor流动

分析两种工作介质下Taylor气泡的形状、上升速度、液膜厚度以及压降特性。结果表明:随着两相表观速度(Vtp)增大

Taylor气泡长度增大

气泡尾部曲率半径增大。气泡长度及内部回流区随着气泡体积分数(ξg)增大而增大

量纲1液膜厚度与气泡上升速度与毛细数(Ca)正相关

模拟结果与经验公式吻合较好。摩擦阻力因子(fc)随Vtp与ξg的增大而降低

N2/乙二醇为工质的Taylor流动fc低于单相情况

而N2/水为工质的Taylor流动fc高于单相情况。Kreutzer等的流型依赖公式以及Lockhart等的分离模型可较好预测本文的两相压降

模拟结果与预测值的误差在±10%以内

常规通道所推荐C 5仍然适用于本文毛细管情况。

Abstract

In order to obtain the frictional characteristics of fully developed Taylor flow in the vertical capillary tube

numerical simulations of the flow in the capillary tube with diameter of 2 mm were conducted by using the moving frame reference method. The shape

rising velocity of Taylor bubble

liquid film thickness and pressure drop were obtained using two different working fluids and analyzed. Simulation results showed that the length of Taylor bubble and the radius of curvature increased with increasing two-phase superficial velocity Vtp. The length of Taylor bubble also increased with increasing gas void ξg

while the nose and tail of Taylor bubble were independent of ξg. Dimensionless thickness of liquid film and rising velocity of Taylor bubbles were proportional to capillary number Ca. Friction factor fc decreased with increasing Vtp and ξg. The fc of Taylor flow with N2/ (CH2OH)2 as working fluid was lower than that of single phase with the same Vtp

while the fc for N2/H2O was higher than that of single phase. The model proposed by Lockhart and Martinelli

and the flow pattern dependent model proposed by Kreutzer et al. could predict the pressure drop obtained from simulation with an error of ±10%. The Chisholm number C 5 which was recommended for conventional tube when both phases were laminar was also reasonable for the capillary tube in the simulation work.

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