Numerical and Experimental Investigation of Air-Water Two-Phase Flow in a Pipe with Three Cavities of Different Aspect Ratios

Nikolaos A. Panopoulos; Dionissios P. Margaris; Georgios M. Kostakontis; Petros E. Styliaras

doi:10.15866/ireme.v9i2.5216

Numerical and Experimental Investigation of Air-Water Two-Phase Flow in a Pipe with Three Cavities of Different Aspect Ratios

Nikolaos A. Panopoulos^(1*), Dionissios P. Margaris⁽²⁾, Georgios M. Kostakontis⁽³⁾, Petros E. Styliaras⁽⁴⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/ireme.v9i2.5216

Abstract

The recirculating air vortex inside an orthogonal cavity with direction vertical to the flow is the motivating idea to investigate numerically with Ansys Fluent and with laboratory experiments the possibility to use the street canyon phenomenon as a novel gas-liquid separation mechanism. Three orthogonal Plexiglas cavities are designed and constructed for laboratory experiments in a recirculating air-water mixture laboratory loop. The air separation efficiency of each cavity is monitored in different operating conditions. The Volume of Fluid (VOF) and the Eulerian multiphase models combined with the Realizable k-ε and the k-ω SST turbulence models are used for the numerical calculations employed with the commercial code Ansys Fluent 14.5. The comparison between the numerical and the experimental data proves that the simple two dimensional model is capable of approaching the laboratory air separation values especially in high air flow rates. Moreover a flow map is created to observe the flow pattern region and to compare with numerical contours of the air volume fraction. Alterations based on the conclusions are to be considered for further research.
Copyright © 2015 Praise Worthy Prize - All rights reserved.

Keywords

Multiphase Model; Street Canyon Phenomenon; Two-Phase Flow; Flow Separator

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