ARTICLE:

• FLOW STRUCTURE AND TURBULENCE MODIFICATION IN A DOWNWARD BUBBLY FLOW  download article

Maksim Pakhomov
Lab. of Thermal and Gas Dynamics Kutateladze Institute of Thermophysics, Russian Academy of Sciences, Siberian Branch, 630090, 1, Acad. Lavrent'ev Avenue, Novosibirsk, Russia

ABSTRACT

A numerical study of the local structure of downward gas-liquid flow in a vertical pipe with 20-mm inner diameter is reported. The unified heterogeneous-medium mechanics approach was used to develop, in the Eulerian two-velocity approximation, a calculation model for downward turbulent gas-liquid bubble flows. It is shown that, as the volumetric gas flow ratio of the mixture at the inlet to the pipe increases, local maxima of carrier phase velocity and bubble concentration emerge in the near-wall zone of the flow, with liquid turbulence suppressed in the wall zone and enhanced in the core of the flow.

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