Experimental study of the gravity influence on the periodic thermocapillary convection around a bubble |
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| Authors: | C Reynard R Santini L Tadrist |
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| Institution: | (1) I.U.S.T.I., C.N.R.S., Université de Provence U.M.R. 6595, 5 rue Enrico Fermi Technople de Chateau Gombert 13453 Marseille cedex 13, France e-mail: reynard@iusti.univ-mrs.fr, FR |
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| Abstract: | The 3D periodic state, following the steady thermocapillary convection state, around an air bubble immersed in a low-Prandtl-number
silicone oil layer under a heated wall was experimentally investigated on the ground and during parabolic flights. This oscillation
was observed under reduced gravity conditions for the first time. Consequently, the initiation of this oscillation seems to
be independent of gravity and so of buoyancy convection. The reduced and increased gravity conditions showed that the gravity
level modifies the oscillation. Its frequency increases with the gravity level. The comparison with the results obtained on
the ground shows the bubble aspect ratio is not a relevant parameter when the gravity varies.
Received: 27 November 2000/Accepted: 25 May 2001 |
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