Heat convection in a vertical channel : Plumes versus turbulent diffusion - Archive ouverte HAL Access content directly
Journal Articles Physics of Fluids Year : 2009

Heat convection in a vertical channel : Plumes versus turbulent diffusion

(1) , (1) , (1) , (1) , (1) , (1)
1

Abstract

Following a previous study [Gibert , Phys. Rev. Lett. 96, 084501 (2006)], convective heat transfer in a vertical channel of moderate dimensions follows purely inertial laws. It would be therefore a good model for convective flows of stars and ocean. Here we report new measurements on this system. We use an intrinsic length in the definition of the characteristic Rayleigh and Reynolds numbers. We explicit the relation between this intrinsic length and the thermal correlation length. Using particle imaging velocimetry, we show that the flow undergoes irregular reversals. We measure the average velocity profiles and the Reynolds stress tensor components. The momentum flux toward the vertical walls seems negligible compared to the shear turbulent stress. A mixing length theory seems adequate to describe the horizontal turbulent heat and momentum fluxes, but fails for the vertical ones. We propose a naive model for vertical heat transport inspired by the Knudsen regime in gases.
Fichier principal
Vignette du fichier
Physics_of_Fluids_2009_Gibert_resubmitted.pdf (588.53 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

ensl-00377244 , version 1 (21-04-2009)

Identifiers

Cite

Mathieu Gibert, Hervé Pabiou, Jean-Christophe Tisserand, Betina B. Gertjerenken, Bernard Castaing, et al.. Heat convection in a vertical channel : Plumes versus turbulent diffusion. Physics of Fluids, 2009, 21 (3), pp.035109. ⟨10.1063/1.3085812⟩. ⟨ensl-00377244⟩
170 View
344 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More