Bubble Movement on Inclined Hydrophobic Surfaces

Ali Kibar, Ridvan Ozbay, Mohammad Amin Sarshar, Yong Tae Kang, Chang Hwan Choi

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


The movement of a single air bubble on an inclined hydrophobic surface submerged in water, including both the upward- and downward-facing sides of the surface, was investigated. A planar Teflon sheet with an apparent contact angle of a sessile water droplet of 106° was used as a hydrophobic surface. The volume of a bubble and the inclination angle of a Teflon sheet varied in the ranges 5-40 μL and 0-45°, respectively. The effects of the bubble volume on the adhesion and dynamics of the bubble were studied experimentally on the facing-up and facing-down surfaces of the submerged hydrophobic Teflon sheet, respectively, and compared. The result shows that the sliding angle has an inverse relationship with the bubble volume for both the upward- and downward-facing surfaces. However, at the same given volume, the bubble on the downward-facing surface spreads over a larger area of the hydrophobic surface than the upward-facing surface due to the greater hydrostatic pressure acting on the bubble on the downward-facing surface. This makes the lateral adhesion force of the bubble greater and requires a larger inclination angle to result in sliding.

Original languageEnglish
Pages (from-to)12016-12027
Number of pages12
Issue number43
Publication statusPublished - 2017 Oct 31

Bibliographical note

Funding Information:
This work was supported by the Scientific and Technical Research Council of Turkey (TUBITAK-BIDEB-2219-1059-B191000491) and the NSF of the United State of America (Award Nos. 1462499 and 1537474).

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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