Détermination des caractéristiques géométriques de la croissance d'une bulle de vapeur et des transferts de chaleur associés : influence des incondensables sur le déclenchement d'instabilités convectives

We present here an experimental work of a single vapor bubble growth in a subcooled liquid bulk (FC-72) at atmospheric pressure. The vapor bubble grows on a downward facing heating element (at constant heating power) on an artificial nucleation site located in the centre of the heated surface. Bubbl...

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Bibliographic Details
Published inMechanics & industry : an international journal on mechanical sciences and engineering applications Vol. 6; pp. 257 - 262
Main Authors Barthes, Magali, Reynard, Christelle, Santini, Robert, Tadrist, Lounes
Format Journal Article
LanguageFrench
Published EDP Sciences 2005
Subjects
Chemical and Process Engineering
Engineering Sciences
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Summary:We present here an experimental work of a single vapor bubble growth in a subcooled liquid bulk (FC-72) at atmospheric pressure. The vapor bubble grows on a downward facing heating element (at constant heating power) on an artificial nucleation site located in the centre of the heated surface. Bubble dynamics are studied thanks to image proceeding. The temporal evolution of geometric parameters, such as diameter, height, volume and shape, are measured. The analysis of some parameters enables us to determine the influence of the heating power on the heat and mass transfers. Moreover an observation, using a shadowgraphy method, of the different modes of convective instabilities is presented. The non condensable gas influence on the occurrence of the instability is discussed.
ISSN:2257-7777
2257-7750