Détermination des caractéristiques géométriques de la croissance dune bulle de vapeur et des transferts de chaleur associés : influence des incondensables sur le déclenchement dinstabilités convectivesReportar como inadecuado




Détermination des caractéristiques géométriques de la croissance dune bulle de vapeur et des transferts de chaleur associés : influence des incondensables sur le déclenchement dinstabilités convectives - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 IUSTI - Institut universitaire des systèmes thermiques industriels

Abstract : 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.





Autor: Magali Barthes - Christelle Reynard - Robert Santini - Lounes Tadrist -

Fuente: https://hal.archives-ouvertes.fr/



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