Modeling the Effect of Bubbles on a Pattern and Heat Transfer in a Turbulent Polydisperse Upward Two-Phase Flow after Sudden Enlargement in a Tube


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

In this work, the numerical modeling of the flow pattern and heat transfer in a polydisperse bubbly turbulent flow after sudden enlargement in a tube is performed. The pattern of average and fluctuation twophase flows at small volumetric gas flow rate ratios (β ≤ 10%) is qualitatively similar to the one-phase liquid flow pattern. It is shown that small bubbles are present almost throughout the entire cross section of a tube, while great bubbles generally pass through the flow core and the shear mixing layer. The addition of air bubbles to a one-phase liquid flow appreciably intensifies heat transfer (up to two times), and these effects become stronger with an increase in the diameter of bubbles and the volumetric gas flow rate ratios gasratios.

About the authors

M. A. Pakhomov

Kutateladze Institute of Thermophysics, Siberian Branch

Author for correspondence.
Email: pakhomov@ngs.ru
Russian Federation, Novosibirsk, 630090

V. I. Terekhov

Kutateladze Institute of Thermophysics, Siberian Branch

Email: pakhomov@ngs.ru
Russian Federation, Novosibirsk, 630090

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2018 Pleiades Publishing, Ltd.