RT Journal Article
T1 Propagating modes in a binary liquid mixture under thermal stress
A1 Croccolo, Fabrizio
A1 García Fernández, Loreto
A1 Bataller, Henri
A1 Vailati, Alberto
A1 Ortiz de Zarate, José María
AB Nonequilibrium temperature and concentration fluctuations inside a binary liquid mixture under the action of a temperature gradient relax back to equilibrium either due to conduction and diffusion at large wave numbers, or due to the quenching determined by gravity at small wave numbers. We investigate the dynamics of nonequilibrium fluctuations in a binary liquid mixture of polystyrene and toluene heated from above under stationary conditions in a thermodiffusion experiment. We show that the strong gravitational stabilization at small wave numbers determines the appearance of propagating modes of nonequilibrium fluctuations as detected through the structure function of shadowgraph images. The propagating modes are the combined effect of temperature and velocity nonequilibrium fluctuations induced by the buoyancy force. The experimental results are in good agreement with a fluctuating hydrodynamics theroretical model including the coupling of fluctuations of velocity, temperature and concentration.
PB Amer Physical Soc
SN 2470-0045
YR 2019
FD 2019-01-03
LK https://hdl.handle.net/20.500.14352/13252
UL https://hdl.handle.net/20.500.14352/13252
LA eng
NO ©2019 American Physical Society. We gratefully acknowledge support from the European Space Agency (ESA) and the Centre National d'Etudes Spatiales (CNES) of France, specifically for supporting the acquisition of the fast camera that made it possible to observe the propagating mode described in this paper. F.C., L.G.F., and H.B. would like to thank E2S-UPPA for financial support. The research at the Complutense University was supported by Grant No. ESP2017-83544-C3-2-P of the Spanish Agencia Estatal de Investigación.
NO Ministerio de Ciencia e Innovación (MICINN)
NO European Space Agency (ESA)
NO Centre National d'Etudes Spatiales (CNES) of France
NO E2S-UPPA
DS Docta Complutense
RD 6 abr 2025