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Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-Benard Convection Guenter Ahlers,1

Summary: Non-Oberbeck-Boussinesq Effects in Gaseous Rayleigh-BeŽnard Convection
Guenter Ahlers,1
Francisco Fontenele Araujo,2
Denis Funfschilling,1
Siegfried Grossmann,3
and Detlef Lohse2
Department of Physics and iQCD, University of California, Santa Barbara, California 93106, USA
Department of Applied Physics and J. M. Burgers Centre for Fluid Dynamics, University of Twente,
7500 AE Enschede, The Netherlands
Department of Physics, Philipps-University of Marburg, Renthof 6, D-35032 Marburg, Germany
(Received 2 December 2006; published 29 January 2007)
Non-Oberbeck-Boussinesq (NOB) effects are measured experimentally and calculated theoretically for
strongly turbulent Rayleigh-BeŽnard 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.


Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara


Collections: Physics