Measuring the Transition Rates of Coalescence Events during Double Phase Separation in Microgravity
Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424, USA
CNRS, Institut de Chimie de la Matière Condensée de Bordeaux, ESEME, Université de Bordeaux, UPR 9048, F-33600 Pessac, France
Physique et Mécanique des Milieux Hétérogènes, UMR 7636 CNRS-ESPCI-Université Pierre et Marie Curie - Université Paris Diderot, 10 rue Vauquelin, 75005 Paris, France
Author to whom correspondence should be addressed.
Received: 15 June 2017 / Accepted: 30 June 2017 / Published: 6 July 2017
Phase transition is a ubiquitous phenomenon in nature, science and technology. In general, the phase separation from a homogeneous phase depends on the depth of the temperature quench into the two-phase region. Earth’s gravity masks the details of phase separation phenomena, which is why experiments were performed under weightlessness. Under such conditions, the pure fluid sulphur hexafluoride (SF
) near its critical point also benefits from the universality of phase separation behavior and critical slowing down of dynamics. Initially, the fluid was slightly below its critical temperature with the liquid matrix separated from the vapor phase. A 0.2 mK temperature quench further cooled down the fluid and produced a double phase separation with liquid droplets inside the vapor phase and vapor bubbles inside the liquid matrix, respectively. The liquid droplets and the vapor bubbles respective distributions were well fitted by a lognormal function. The evolution of discrete bins of different radii allowed the derivation of the transition rates for coalescence processes. Based on the largest transition rates, two main coalescence mechanisms were identified: (1) asymmetric coalescences between one small droplet of about 20
m and a wide range of larger droplets; and (2) symmetric coalescences between droplets of large and similar radii. Both mechanisms lead to a continuous decline of the fraction of small radii droplets and an increase in the fraction of the large radii droplets. Similar coalescence mechanisms were observed for vapor bubbles. However, the mean radii of liquid droplets exhibits a
evolution, whereas the mean radii of the vapor bubbles exhibit a
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Oprisan, A.; Garrabos, Y.; Lecoutre, C.; Beysens, D. Measuring the Transition Rates of Coalescence Events during Double Phase Separation in Microgravity. Molecules 2017, 22, 1125.
Oprisan A, Garrabos Y, Lecoutre C, Beysens D. Measuring the Transition Rates of Coalescence Events during Double Phase Separation in Microgravity. Molecules. 2017; 22(7):1125.
Oprisan, Ana; Garrabos, Yves; Lecoutre, Carole; Beysens, Daniel. 2017. "Measuring the Transition Rates of Coalescence Events during Double Phase Separation in Microgravity." Molecules 22, no. 7: 1125.
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