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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
1
Department of Physics and iQCD, University of California, Santa Barbara, California 93106, USA
2
Department of Applied Physics and J. M. Burgers Centre for Fluid Dynamics, University of Twente,
7500 AE Enschede, The Netherlands
3
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