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Entrapment and cross-flow transport of air bubbles by a hydrophobic strip in a turbulent channel flow

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Abstract

We experimentally investigate air bubbles sticking to a hydrophobic strip on a hydrophilic ceiling in a horizontal turbulent channel flow. Simultaneous measurements of wall-sticking bubbles are conducted in two perpendicular planes using two cameras to estimate their size and contact angles and hence evaluate the drag coefficient. In a range of the bubble Reynolds number, Reb (250 ≤ Reb ≤ 1480) and a range of the Weber number, We (0.7 ≤ We ≤ 6.5), the drag coefficient for a single, deformable bubble stuck on the surface is almost independent of Reb and We and tends to be slightly higher than that of a non-deformable bubble fixed on a wall in linear shear flow. We also investigate the entrapment and cross-flow transport of air bubbles using an oriented hydrophobic strip on a hydrophilic surface. Bubbles creeping along the hydrophobic strip become trapped when reaching its edge where the downstream contact angle changes. When the strip edge is inclined relative to the flow, bubbles creep along the hydrophobic–hydrophilic boundary and thus move in the cross-stream direction. The cross-stream transport of the bubbles strongly depends on the channel Reynolds number and the angle between the hydrophobic strip and the stream.

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Acknowledgements

The authors gratefully acknowledge support in the form of a Grant-in-Aid for Scientific Research (C) (Grant No. 19K04217) and thank Mr. T. Satoda and Mr. T. Nakagawa of Kyoto Institute of Technology for their assistance with data collection.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan

    Atsuhide Kitagawa

  2. School of Engineering, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK

    Petr Denissenko

  3. Laboratory for Flow Control, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan

    Yuichi Murai

Authors
  1. Atsuhide Kitagawa
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  2. Petr Denissenko
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  3. Yuichi Murai
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Correspondence to Atsuhide Kitagawa.

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Appendix: Profiles of streamwise mean velocity of liquid phase u at Re = 2000–5000

Appendix: Profiles of streamwise mean velocity of liquid phase u at Re = 2000–5000

Figure 

Fig. 15
figure 15

Profiles of streamwise mean velocity of liquid phase u at Re = 2000–5000. The error bars indicate the standard deviation of the data

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15 shows the profiles of the mean velocity of liquid phase in the streamwise direction, u, measured by particle tracking velocimetry at Re = 2000–5000.

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Kitagawa, A., Denissenko, P. & Murai, Y. Entrapment and cross-flow transport of air bubbles by a hydrophobic strip in a turbulent channel flow. Exp Fluids 62, 198 (2021). https://doi.org/10.1007/s00348-021-03288-3

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  • DOI: https://doi.org/10.1007/s00348-021-03288-3

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