title: Frozen-wave instability in near-critical hydrogen subjected to horizontal vibration under various gravity fields.
abstract: The frozen-wave instability which appears at a liquid-vapor interface when a harmonic vibration is applied in a direction tangential to it has been less studied until now. The present paper reports experiments on hydrogen (H2) in order to study this instability when the temperature is varied near its critical point for various gravity levels. Close to the critical point, a liquid-vapor density difference and surface tension can be continuously varied with temperature in a scaled, universal way. The effect of gravity on the height of the frozen waves at the interface is studied by performing the experiments in a magnetic facility where effective gravity that results from the coupling of the Earth's gravity and magnetic forces can be varied. The stability diagram of the instability is obtained. The experiments show a good agreement with an inviscid model [Fluid Dyn. 21 849 (1987)], irrespective of the gravity level. It is observed in the experiments that the height of the frozen waves varies weakly with temperature and increases with a decrease in the gravity level, according to a power law with an exponent of 0.7. It is concluded that the wave height becomes of the order of the cell size as the gravity level is asymptotically decreased to zero. The interface pattern thus appears as a bandlike pattern of alternate liquid and vapor phases, a puzzling phenomenon that was observed with CO2 and H2 near their critical point in weightlessness [Acta Astron. 61 1002 (2007); Europhys. Lett. 86 16003 (2009)].
authors.affiliation: SBT, UMR-E CEA/UJF-Grenoble 1, INAC, F-38054 Grenoble, France.
authors.forename: G
authors.initials: G
authors.lastname: Gandikota
authors.affiliation: SBT, UMR-E CEA/UJF-Grenoble 1, INAC, F-38054 Grenoble, France.
authors.forename: D
authors.initials: D
authors.lastname: Chatain
authors.affiliation: Université Bordeaux 1, Institut de Mécanique et d'Ingénierie-UMR CNRS 5295, 16 Avenue Pey Berland, F-33607 Pessac Cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Amiroudine
authors.affiliation: Institute of Continuous Media Mechanics UB RAS, 1 Koroleva Street, 614013 Perm, Russia and Perm State University, 15 Bukireva Street, 614990 Perm, Russia.
authors.forename: T
authors.initials: T
authors.lastname: Lyubimova
authors.affiliation: SBT, UMR-E CEA/UJF-Grenoble 1, INAC, F-38054 Grenoble, France and CEA-ESEME, ESPCI-PMMH, 10 rue Vauquelin, F-75005 Paris, France.
authors.forename: D
authors.initials: D
authors.lastname: Beysens
mesh_terms: D005615:Freezing; D006112:Gravitation; D006859:Hydrogen / Q000737:chemistry*; D008422:Materials Testing; D008956:Models, Chemical; D044367:Phase Transition; D014732:Vibration
chemical_list: D006859:Hydrogen