OPRISAN, Ana; OPRISAN, Sorinel Adrian; HEGSETH, John; GARRABOS, Yves; LECOUTRE-CHABOT, Carole; BEYSENS, Daniel

doi:10.1103/PhysRevE.77.051118

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OPRISAN, Ana
Department of Physics and Astronomy [Charleston]

OPRISAN, Sorinel Adrian
Department of Physics and Astronomy [Charleston]

HEGSETH, John
Department of Physics [New Orleans]

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Physical Review E : Statistical, Nonlinear, and Soft Matter Physics. 2008, vol. 77, n° 5, p. 051118 (13 p.)

American Physical Society

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We present both the experimental and computational methods and results of phase-separating experiments performed with sulfur hexafluoride (SF6) close to its critical density. These experiments were performed in microgravity to suppress buoyancy and convection-driven effects. Phase separation under reduced gravity is analyzed for both 0.3 mK and 3.6 mK temperature quenches in order to derive the early-stage growth law. We found a 1/3 growth law for early stages of phase separation for a volume fraction of minority domains of 50%. Our findings support the hypothesis of a crossover between Brownian motion and hydrodynamic effects in the early stages of phase separation. The temperature inside the bulk of the pure fluid was estimated using a proposed histogram method. Our histogram method allowed temperature estimation below thermistors' sensitivity and detected small temperature variations inside the bulk of the pure fluid.< Réduire

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Equilibrium properties

Critical points

Phase transitions

Growth

Microgravity

Tests

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Universality in early-stage growth of phase-separating domains near the critical point

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