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Article Dans Une Revue EPL - Europhysics Letters Année : 2002

Liquid-vapor phase separation in a thermocapillary force field

Résumé

We study the growth of gas bubbles surrounded by liquid during the phase separation of a pure CO2 sample quenched from one-phase to two-phase region of the phase diagram by rapid cooling in microgravity. The vicinity of the critical point ensures slowing-down of the growth process. The bubble growth by coalescence is modified by local laser heating. It induces a thermocapillary (Marangoni) effect that attracts the bubbles towards the center of the beam. At the beginning of the phase separation, a bubble is trapped there and "captures" the surrounding bubbles. The growth exponent for the central bubble radius is close to 0.5, while that for the other bubbles is 1/3. We present a theoretical model that explains the experimental data and justifies that the temperature can vary along the gas-liquid interface in a pure fluid during its phase separation.

Domaines

Matériaux

Dates et versions

hal-00720133 , version 1 (23-07-2012)

Identifiants

Citer

Daniel Beysens, Yves Garrabos, Vadim Nikolayev, Carole Lecoutre-Chabot, Jean-Pierre Delville, et al.. Liquid-vapor phase separation in a thermocapillary force field. EPL - Europhysics Letters, 2002, 59 (2), pp.245-251. ⟨10.1209/epl/i2002-00233-9⟩. ⟨hal-00720133⟩
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