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Thermal transfer in Rayleigh–Bénard cell with smooth or rough boundaries

Published online by Cambridge University Press:  28 December 2017

E. Rusaouën Open the ORCID record for E. Rusaouën [Opens in a new window] ,
O. Liot ,
B. Castaing ,
J. Salort Open the ORCID record for J. Salort [Opens in a new window]  and
F. Chillà
E. Rusaouën*
Affiliation:
Univ. Lyon, ENS de Lyon, Univ. Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France
O. Liot
Affiliation:
Univ. Lyon, ENS de Lyon, Univ. Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France
B. Castaing
Affiliation:
Univ. Grenoble Alpes, CNRS, Grenoble INP, LEGI, F-38000 Grenoble, France
J. Salort
Affiliation:
Univ. Lyon, ENS de Lyon, Univ. Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France
F. Chillà
Affiliation:
Univ. Lyon, ENS de Lyon, Univ. Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France
*
†Present address: Univ. Grenoble Alpes, CNRS, Grenoble INP, LEGI, F-38000 Grenoble, France. Email address for correspondence: eleonore.rusaouen@ens-lyon.fr
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Abstract

Several Rayleigh–Bénard experiments in water are performed with smooth or rough boundaries. We present new thermal transfer measurements obtained with large roughness elements arranged in a square lattice. The data are compared to previous data obtained with smaller elements in the same cell (Tisserand et al., Phys. Fluids, vol. 23, 2011). Experiments in the same apparatus without roughness are presented, as reference results, to allow for comparison. In the rough case, several regimes of heat transfer are identified: one similar to the smooth case, an enhanced heat transfer regime characterized by a modification of the Nusselt versus Rayleigh number relation and a third part where the relation can be similar to a smooth one with a corrected prefactor.

JFM classification

Convection: Convection Turbulent Flows: Turbulent Flows
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 837 , 25 February 2018 , pp. 443 - 460
Copyright
© 2017 Cambridge University Press 

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Footnotes

‡

Present address: LAAS-CNRS, 7 avenue du Colonel Roche, BP54200 31031 Toulouse CEDEX 4, France.

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