Open Archive TOULOUSE Archive Ouverte (OATAO) EXPERIMENTAL STUDY OF BOILING IN POROUS MEDIA: EFFECT OF THE VOID FRACTION ON THE CRITICAL HEAT FLUX

Ange Gourbil, Duru, Paul, Fichot, Florian, Quintard, Michel Prat, Marc, A Gourbil, P Duru, F Fichot, M Quintard (+1 others)
2016 unpublished
OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 16112 To cite this version : ABSTRACT Forced-convection boiling is experimentally studied in a two-dimensional heat-generating model porous medium. Visualizations of the two-phase flow and thermal measurements inside the test section are performed. Boiling curves
more » ... show that the critical heat flux on a specific heating element decreases as the global thermal power released by the porous medium increases. Also, visualizations show that the void fraction in the test section increases with the global heating power. An image processing program was developed to measure the void fraction, in order to investigate its influence on the critical heat flux. Such a measurement is validated using a second test section where air is injected at a known flow rate inside the device, in isothermal conditions, and where flow regimes comparable to those observed in the boiling experiment are obtained.
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