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Simultaneous temperature and velocity Lagrangian measurements in turbulent thermal convection

Published online by Cambridge University Press:  06 April 2016

O. Liot ,
F. Seychelles ,
F. Zonta ,
S. Chibbaro ,
T. Coudarchet ,
Y. Gasteuil ,
J.-F. Pinton ,
J. Salort  and
F. Chillà
O. Liot
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon CEDEX 7, France
F. Seychelles
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon CEDEX 7, France
F. Zonta
Affiliation:
Dip. Ing. Elettrica, Gestionale e Meccanica, Via delle scienze 208, 33100 Udine, Italy
S. Chibbaro
Affiliation:
Sorbonne Universités, UPMC Univ Paris 06, UMR 7190, Institut Jean Le Rond d’Alembert, F-75005, Paris, France CNRS, UMR 7190, Institut Jean Le Rond d’Alembert, F-75005, Paris, France
T. Coudarchet
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon CEDEX 7, France
Y. Gasteuil
Affiliation:
smartINST, 213 rue de Gerland, 69007 Lyon, France
J.-F. Pinton
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon CEDEX 7, France
J. Salort
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon CEDEX 7, France
F. Chillà*
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon CEDEX 7, France
*
†Email address for correspondence: [email protected]
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Abstract

We report joint Lagrangian velocity and temperature measurements in turbulent thermal convection. Measurements are performed using an improved version (extended autonomy) of the neutrally buoyant instrumented particle (Shew et al., Rev. Sci. Instrum., vol. 78, 2007, 065105) that was used by Gasteuil et al. (Phys. Rev. Lett., vol. 99, 2007, 234302) to performed experiments in a parallelepipedic Rayleigh–Bénard cell. The temperature signal is obtained from a radiofrequency transmitter. Simultaneously, we determine a particle’s position and velocity with one camera, which grants access to the Lagrangian heat flux. Due to the extended autonomy of the present particle, we obtain well-converged temperature and velocity statistics, as well as pseudo-Eulerian maps of velocity and heat flux. Present experimental results have also been compared with the results obtained by a corresponding campaign of direct numerical simulations and Lagrangian tracking of massless tracers. The comparison between experimental and numerical results shows the accuracy and reliability of our experimental measurements and points also out the finite-size effects of the particle. Finally, the analysis of Lagrangian velocity and temperature frequency spectra is shown and discussed. In particular, we observe that temperature spectra exhibit an anomalous $f^{-2.5}$ frequency scaling, likely representing the ubiquitous passive and active scalar behaviour of temperature.

JFM classification

Convection: Convection Convection: Plumes/thermals Turbulent Flows: Turbulent convection
Type
Papers
Information
Journal of Fluid Mechanics , Volume 794 , 10 May 2016 , pp. 655 - 675
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© 2016 Cambridge University Press 

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