Volume 59, Number 2, July 2002
|Page(s)||245 - 251|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 July 2002|
Liquid-vapor phase separation in a thermocapillary force field
ESEME, Service des Basses Températures, DSM/DRFMC,
CEA-Grenoble Grenoble, France (Mailing address: CEA-ESEME, Institut de
Chimie de la Matière Condensée de Bordeaux -
87 Avenue du Dr. Schweitzer, 33608 Pessac Cedex, France.)
2 CNRS-ESEME, Institut de Chimie de la Matière Condensée de Bordeaux 87, Avenue du Dr. Schweitzer, 33608 Pessac Cedex, France
3 Centre de Physique Moléculaire, Optique et Hertzienne, CNRS Université de Bordeaux I - Cours de la Libération, 33405 Talence Cedex, France
4 Department of Physics, University of New Orleans - New Orleans, LA 70148, USA
Corresponding author: firstname.lastname@example.org
Accepted: 17 April 2002
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.
PACS: 68.35.Rh – Phase transitions and critical phenomena / 44.35.+c – Heat flow in multiphase systems / 68.03.Cd – Surface tension and related phenomena
© EDP Sciences, 2002
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