This article is cited in 17 papers

PLASMA, HYDRO- AND GAS DYNAMICS

On drag reduction in a two-phase flow

E. Ya. Gatapova^a, V. S. Azhaev^ab, O. A. Kabov<sup>cad

a</sup> S.S. Kutateladze Institute of Thermophysics, Siberian Division of the Russian Academy of Sciences
^b Southern Methodist University
^c Tomsk Polytechnic University
^d Novosibirsk State University

Abstract: 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.

Received: 25.09.2014
Revised: 01.12.2014

DOI: 10.7868/S0370274X15030054

 English version: Journal of Experimental and Theoretical Physics Letters, 2015, 101:3, 160–163

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