Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Bénard Convection

Günter Ahlers, F. Fontenele Araujo Junior, Denis Funfschilling, Siegfried Grossmann, Detlef Lohse

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Non-Oberbeck-Boussinesq (NOB) effects are measured experimentally and calculated theoretically for strongly turbulent Rayleigh-Be´nard convection of ethane gas under pressure where the material properties strongly depend on the temperature. Relative to the Oberbeck-Boussinesq case we find a decrease of the central temperature as compared to the arithmetic mean of the top- and bottom-plate temperature and an increase of the Nusselt number. Both effects are of opposite sign and greater magnitude than those for NOB convection in liquids like water.
Original languageUndefined
Pages (from-to)054501-1-051501-4
Number of pages4
JournalPhysical review letters
Issue number5
Publication statusPublished - 2007


  • IR-58976
  • METIS-237122

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