Issue
EPL
Volume 77, Number 1, January 2007
Article Number 14001
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/77/14001
Published online 12 January 2007
EPL, 77 (2007) 14001
DOI: 10.1209/0295-5075/77/14001

Non-condensable gas influence on the Marangoni convection during a single vapour bubble growth in a subcooled liquid

M. Barthes, C. Reynard, R. Santini and L. Tadrist

Laboratoire IUSTI CNRS UMR 6595 - 5 Rue Enrico Fermi, technopôle de Château-Gombert, 13453 Marseille Cedex 13, France


received 12 April 2006; accepted in final form 9 November 2006; published January 2007
published online 12 January 2007

Abstract
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