SCI和EI收录∣中国化工学会会刊

›› 2015, Vol. 23 ›› Issue (9): 1460-1468.DOI: 10.1016/j.cjche.2015.07.012

• 流体力学与传递现象 • 上一篇    下一篇

Computational fluid dynamic simulations on liquid film behaviors at flooding in an inclined pipe

Jianye Chen1, Yuan Tang1, Wei Zhang2, Yuchen Wang1, Limin Qiu1, Xiaobin Zhang1   

  1. 1 Institute of Refrigeration and Cryogenics, Key Laboratory of Refrigeration and Cryogenic of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;
    2 China Aerodynamics Research and Development Center, Mianyang 621000, China
  • 收稿日期:2015-03-31 修回日期:2015-07-09 出版日期:2015-09-28 发布日期:2015-10-24
  • 通讯作者: Xiaobin Zhang
  • 基金资助:
    Supported by the Major State Basic Research Development Program of China (2011CB706501) and the National Natural Science Foundation of China (51276157).

Computational fluid dynamic simulations on liquid film behaviors at flooding in an inclined pipe

Jianye Chen1, Yuan Tang1, Wei Zhang2, Yuchen Wang1, Limin Qiu1, Xiaobin Zhang1   

  1. 1 Institute of Refrigeration and Cryogenics, Key Laboratory of Refrigeration and Cryogenic of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;
    2 China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2015-03-31 Revised:2015-07-09 Online:2015-09-28 Published:2015-10-24
  • Supported by:
    Supported by the Major State Basic Research Development Program of China (2011CB706501) and the National Natural Science Foundation of China (51276157).

摘要: The complex liquid film behaviors at flooding in an inclined pipe were investigated with computational fluid dynamic (CFD) approaches. The liquid film behaviors included the dynamicwave characteristics before flooding and the transition of flow pattern when flooding happened. The influences of the surface tension and liquid viscosity were specially analyzed. Comparisons of the calculated velocity at the onset of flooding with the available experimental results showed a good agreement. The calculations verify that the fluctuation frequency and the liquid film thickness are almost unaffected by the superficial gas velocity until the flooding is triggered due to the Kelvin-Helmholtz instability. When flooding triggered at the superficial liquid velocity larger than 0.15 m·s-1, the interfacial wave developed to slug flow, while it developed to entrainment flow when it was smaller than 0.08 m·s-1. The interfacial waves were more easily torn into tiny droplets with smaller surface tension, eventually evolving into the mist flow.When the liquid viscosity increases, the liquid film has a thicker holdup with more intensive fluctuations, and more likely developed to the slug flow.

关键词: Two phase flow, Flooding, Countercurrent flow limitation, Computational fluid dynamic, Liquid film, Inclined pipe

Abstract: The complex liquid film behaviors at flooding in an inclined pipe were investigated with computational fluid dynamic (CFD) approaches. The liquid film behaviors included the dynamicwave characteristics before flooding and the transition of flow pattern when flooding happened. The influences of the surface tension and liquid viscosity were specially analyzed. Comparisons of the calculated velocity at the onset of flooding with the available experimental results showed a good agreement. The calculations verify that the fluctuation frequency and the liquid film thickness are almost unaffected by the superficial gas velocity until the flooding is triggered due to the Kelvin-Helmholtz instability. When flooding triggered at the superficial liquid velocity larger than 0.15 m·s-1, the interfacial wave developed to slug flow, while it developed to entrainment flow when it was smaller than 0.08 m·s-1. The interfacial waves were more easily torn into tiny droplets with smaller surface tension, eventually evolving into the mist flow.When the liquid viscosity increases, the liquid film has a thicker holdup with more intensive fluctuations, and more likely developed to the slug flow.

Key words: Two phase flow, Flooding, Countercurrent flow limitation, Computational fluid dynamic, Liquid film, Inclined pipe