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TECHNICAL PAPERS: Two-Phase Flow and Heat Transfer

A Thermodynamic Nonequilibrium Slug Flow Model

[+] Author and Article Information
Jader R. Barbosa

Department of Mechanical Engineering, Federal University of Santa Catarina, Florianópolis—SC—88040900, Brazile-mail: jrb@nrva.ufsc.br

Geoffrey F. Hewitt

Department of Chemical Engineering and Chemical Technology, Imperial College, London, Prince Consort Road, London, SW7 2BY, UKe-mail: g.hewitt@imperial.ac.uk

J. Heat Transfer 127(3), 323-331 (Mar 24, 2005) (9 pages) doi:10.1115/1.1857945 History: Received December 22, 2003; Revised September 10, 2004; Online March 24, 2005
Copyright © 2005 by ASME
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References

Figures

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Heat transfer coefficient enhancement near zero quality. Experimental conditions: fluid: n-pentane, inlet pressure: 6.0 bar, total mass flux: 377.4 kg/m2  s, wall heat flux: 49.9 kW/m2 , inlet temperature: 67.5°C.
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Profiles of experimental (center line), saturation, equilibrium bulk and liquid slug temperature profiles. Experimental conditions: fluid: n-pentane, inlet pressure: 6.0 bar, mass flux: 377.4 kg/m2  s, wall heat flux: 49.9 kW/m2 , inlet temperature: 67.5°C.
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A schematic representation of real slug flow
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(a) A schematic representation of the transfer of energy into the liquid slug; (b) illustration of the wall superheat and the liquid shedding into the film region
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Variation of the difference between the equilibrium and slug temperatures as a function of distance. Coincidence of temperature difference and heat transfer coefficient peaks. Experimental conditions: fluid: iso-octane, inlet pressure: 3.1 bar, total mass flux: 200.8 kg/m2  s, wall heat flux: 19.5 kW/m2 , inlet temperature: 117.4°C.
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Variation of the difference between the equilibrium and slug temperatures as a function of distance. Experimental conditions: fluid: iso-octane, inlet pressure: 2.2 bar, total mass flux: 296.7 kg/m2  s, wall heat flux: 60.1 kW/m2 , inlet temperature: 55.3°C.
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Variation of LS,LB, and β. Experimental conditions: fluid: iso-octane, inlet pressure: 3.1 bar, total mass flux: 200.8 kg/m2  s, wall heat flux: 19.5 kW/m2 , inlet temperature: 117.4°C.
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Taylor bubble and liquid slug velocity profiles as a function of distance in the region of occurrence of slug flow. The equilibrium liquid velocity is shown for comparison. Experimental conditions: fluid: n-pentane, inlet pressure: 4.9 bar, total mass flux: 376.0 kg/m2  s, wall heat flux: 50.0 kW/m2 , inlet temperature: 60.7°C.
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Local heat transfer coefficient prediction. Experimental conditions: fluid: n-pentane, inlet pressure: 6.0 bar, total mass flux: 377.4 kg/m2  s, wall heat flux: 49.9 kW/m2 , inlet temperature: 67.5°C.
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Local heat transfer coefficient prediction. Experimental conditions: fluid: iso-octane, inlet pressure: 3.1 bar, total mass flux: 200.8 kg/m2  s, wall heat flux: 19.5 kW/m2 , inlet temperature: 117.4°C.
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Overall comparison of local heat transfer coefficient predictions

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