Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Numerical study on pressure drop with moving contact lines of dry slug flow in a hydrophobic minichannel

소수성 미니채널 내 움직이는 접촉선을 가진 액체슬러그의 압력 강하에 대한 수치해석

  • Jeon, Jun Ho (Department of Mechanical Design Engineering, Graduated school of Pukyong National University) ;
  • Park, Su Chung (Research Institute of Industrial Science and Technology, Pukyong National University) ;
  • Yu, Dong In (Department of Mechanical Design Engineering, Pukyong National University) ;
  • Kim, Tae Hun (Research Institute of Industrial Science and Technology, Pukyong National University) ;
  • Lee, Yeon Won (Department of Mechanical Design Engineering, Pukyong National University)
  • Received : 2020.11.23
  • Accepted : 2020.12.22
  • Published : 2020.12.31
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Abstract

In this study, a single-phase analysis of droplet slug with different contact angles was performed based on the visualization of experimental results. Droplet slug - flowing between gases in a hydrophobic mini channel - moves with a triple contact line without a gas liquid film on the wall. The results show that the rotational flow inside the droplet occurred; this was compared and verified with the results of two-phase analysis. The pressure field shows pressure rise at the front and rear ends. The effective length - the section that satisfies the laminar flow condition - became shorter as the droplet velocity increased. The Choi's correlation for the effective length agrees with this analysis results with a slight difference. This difference is judged as the difference in the contact angle of the slug model.

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References

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