On drag reduction in a two-phase flow

E. Ya Gatapova, Vladimir Sergeevich Ajaev, O. A. Kabov

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Bubbles collected on a local hydrophobic surface with nanocoating in a two-phase flow in a minichannel have been detected experimentally. It has been proposed to use the effect of concentration of gas bubbles on hydrophobic segments of the surface of the channel with contrast wettability for ensuring drag reduction. A two-dimensional flow model with the Navier slip condition in the region of the bubble layer gives criteria of drag reduction, depending on the slip length, dimension of bubbles, and dimension of the segment with nanocoating. The presence of the bubble layer on half of the surface of the channel can increase the flow rate of a liquid flowing through the channel by 40% at a fixed pressure gradient.

Original languageEnglish
Pages (from-to)160-163
Number of pages4
JournalJETP Letters
Issue number3
Publication statusPublished - 1 Feb 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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