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Research Papers: Multiphase Flows

Numerical Prediction of Flow Patterns in Bubble Pumps

[+] Author and Article Information
Ali Benhmidene

Research Unit Environment, Catalysis and Process Analysis (URECAP), The National School of Engineering of Gabès, Omar Ibn El Khattab Street, Gabes 6029, Tunisiaaahmiden@yahoo.fr

Bechir Chaouachi

Research Unit Environment, Catalysis and Process Analysis (URECAP), The National School of Engineering of Gabès, Omar Ibn El Khattab Street, Gabes 6029, Tunisiabechir.chaouachi@enig.rnu.tn

Mahmoud Bourouis

Department of Mechanical Engineering, Universitat Rovira i Virgili, Avenida Països Catalans 26, 43007 Tarragona, Spainmahmoud.bourouis@urv.cat

Slimane Gabsi

Research Unit Environment, Catalysis and Process Analysis (URECAP), The National School of Engineering of Gabès, Omar Ibn El Khattab Street, Gabes 6029, Tunisiaslimane.gabsi@isetsf.rnu.tn

J. Fluids Eng 133(3), 031302 (Mar 15, 2011) (8 pages) doi:10.1115/1.4003664 History: Received August 10, 2010; Revised January 31, 2011; Published March 15, 2011; Online March 15, 2011

In the present study, the ammonia-water mixing flow in a bubble pump is numerically simulated. The flow patterns of a two-phase flow in a bubble pump were studied under different conditions of heat flux and tube diameter. A one-dimensional two-fluid model was developed under constant heat flux. This model was used to predict the variations in void fraction and liquid and vapor velocities throughout the tube. Then, the void fraction profile and the curve of liquid velocity versus vapor velocity were used to predict the flow patterns along the tube length. It was found that at heat fluxes below 15kWm2, bubbly, slug, and churn flows are the dominating regimes, and the length of these flow regimes depends on the tube diameter. For heat fluxes higher than 15kWm2, the bubble pump operates under the churn and annular regimes, and the bubble pump performance is improved when the tube diameter increases.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Comparison of calculated void fraction values with other models

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Figure 2

Void fraction profile for different tube diameters (q=5 W m−2)

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Figure 3

Void fraction profile for different tube diameters (q=15 W m−2)

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Figure 4

Void fraction profile for different tube diameters (q=25 W m−2)

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Figure 5

Void fraction distribution for different heat fluxes

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Figure 6

Liquid velocity versus vapor velocity for different tube diameters (q=5 kW m−2)

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Figure 7

Liquid velocity versus vapor velocity for different tube diameters (q=15 kW m−2)

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Figure 8

Liquid velocity versus vapor velocity for different tube diameters (q=25 kW m−2)

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Figure 9

Flow pattern map (q=25 kW m−2)

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