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Microgravity Science and Technology

, Volume 25, Issue 4, pp 251–265 | Cite as

Evaporation Rates and Bénard-Marangoni Supercriticality Levels for Liquid Layers Under an Inert Gas Flow

  • H. MachrafiEmail author
  • N. Sadoun
  • A. Rednikov
  • S. Dehaeck
  • P. C. Dauby
  • P. Colinet
Original Article

Abstract

In this work, we propose an approximate model of evaporation-induced Bénard-Marangoni instabilities in a volatile liquid layer with a free surface along which an inert gas flow is externally imposed. This setting corresponds to the configuration foreseen for the ESA—“EVAPORATION PATTERNS” space experiment, which involves HFE-7100 and nitrogen as working fluids. The approximate model consists in replacing the actual flowing gas layer by an “equivalent” gas at rest, with a thickness that is determined in order to yield comparable global evaporation rates. This allows studying the actual system in terms of an equivalent Pearson’s problem (with a suitably defined wavenumber-dependent Biot number at the free surface), allowing to estimate how far above critical the system is for given control parameters. Among these, a parametric analysis is carried out as a function of the liquid-layer thickness, the flow rate of the gas, its relative humidity at the inlet, and the ambient pressure and temperature.

Keywords

Evaporation rate Supercriticality Marangoni instability Microgravity experiment 

Notes

Acknowledgments

The authors gratefully acknowledge financial support from ESA and BELSPO PRODEX projects. PC acknowledges financial support of the Fonds de la Recherche Scientifique—FNRS.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • H. Machrafi
    • 1
    Email author
  • N. Sadoun
    • 2
    • 3
  • A. Rednikov
    • 2
  • S. Dehaeck
    • 2
  • P. C. Dauby
    • 1
  • P. Colinet
    • 2
  1. 1.Thermodynamique des Phénomènes Irréversibles, Institut de Physique B5aUniversité de LiègeLiège 1Belgium
  2. 2.TIPs – Fluid PhysicsUniversité Libre de BruxellesBruxellesBelgium
  3. 3.Laboratoire de Mècanique des Fluides Thèorique et Appliquèe, Facultè de PhysiqueUSTHBAlgerAlgeria

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