Volume 77, Number 1, January 2007
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||12 January 2007|
Non-condensable gas influence on the Marangoni convection during a single vapour bubble growth in a subcooled liquid
Laboratoire IUSTI CNRS UMR 6595 - 5 Rue Enrico Fermi, technopôle de Château-Gombert, 13453 Marseille Cedex 13, France
Accepted: 9 November 2006
Liquid convective instabilities during a single vapour bubble growth in subcooled FC-72 are experimentally investigated. The bubble was created on an artificial nucleation site located on a downward-facing heating element. For a non-degassed liquid, convective instabilities were observed using a shadowgraphy method and tracer particles. Both stationary and oscillatory modes were observed, and this instability was found to be Marangoni convection. Comparing results with a degassed and a non-degassed liquid, it was found that the onset of Marangoni convection was due to the presence of non-condensable gases in the liquid. Finally, the combination of Marangoni convection and condensation enables us to highlight a thermal oscillator, with a change in the type of oscillatory motion during the condensation phase.
PACS: 47.55.dp – Cavitation and boiling / 47.55.pf – Marangoni convection / 47.55.dm – Thermocapillary effects
© Europhysics Letters Association, 2007
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