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THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
July, 10-13, 2018, Rio de Janeiro, Brazil

DOI: 10.1615/THMT-18


ISBN Print: 978-1-56700-468-7

ISBN Online: 978-1-56700-467-0

ISSN Print: 2377-2816

Velocity Field and Bubble Size Measurements of a Gas/liquid Flow Across a T-junction

pages 437-440
DOI: 10.1615/THMT-18.420
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RÉSUMÉ

A gas-liquid mixture that flows through a T-junction can be partially or totally separated depending on the geometrical configuration, on the flow characteristics and on the inlet-outlets pressure drops. This problem is ruled by a balance between inertia, buoyancy and pressure forces, however, the theoretical prediction of the separated gas fraction is not a simple task. This work is focused on the experimental characterization of the dynamical properties of gas-liquid flow separation in a particular configuration of T-junction, which is composed by an inlet pipe inclined downwards and by a vertically upward branch. Different conditions of air and water flow rates were evaluated. The mean velocity and turbulent statistics of the liquid phase were characterized by means of Particle Image Velocimetry (PIV). A Shadow Sizer system was used to characterize the properties of the two-phase flow, such as bubble length, bubble velocity and frequency of bubble separation. Results quantify all the variables needed to propose and validate a simple theoretical model for the prediction of the separation efficiency.

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