High Rayleigh number convection with gaseous helium at low temperature

This article presents an experimental set-up to study the turbulent regime of free thermal convection in a Rayleigh-Benard cell. Helium gas around 4 K is confined in a cell of aspect ratio 0.5. With a thermocouple technique we can measure temperature differences across the cell as low as 0.2 mK, whi...

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Bibliographic Details
Published in:	Journal of low temperature physics Vol. 104; no. 1-2; pp. 109 - 129
Main Authors:	CHAVANNE, X, CHILLA, F, CHABAUD, B, CASTAING, B, CHAUSSY, J, HEBRAL, B
Format:	Journal Article
Language:	English
Published:	Heidelberg Springer 01-07-1996
Subjects:	Convection and heat transfer Exact sciences and technology Fluid dynamics Fundamental areas of phenomenology (including applications) Physics Turbulent flows, convection, and heat transfer Prandtl number Nusselt number Instrumentation Experimental study Rayleigh number Aspect ratio Benard convection Power law Heat transfer
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Summary:	This article presents an experimental set-up to study the turbulent regime of free thermal convection in a Rayleigh-Benard cell. Helium gas around 4 K is confined in a cell of aspect ratio 0.5. With a thermocouple technique we can measure temperature differences across the cell as low as 0.2 mK, which allows to test the adiabatic gradient effect. Covering a large range of Rayleigh numbers (10 super(3) to 5 x 10 super(12)), Nusselt numbers from 1 to 10 super(3) are obtained. The results are compared with previous works. They show a departure from the 2/7 power law above Ra identical with 3 x 10 super(10).
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0022-2291 1573-7357
DOI:	10.1007/BF00754092