Influence of wind on heat transfer in turbulent convection with roughness
Influence de la circulation à grande échelle sur le transfert de chaleur en convection turbulente rugueuse
Résumé
Direct 3D numerical simulations are carried out in periodic and confined Rayleigh-Bénard
cases for a Rayleigh number equal to 10 10 . The lower plate is either smooth or rough. Periodic domains
aim to reproduce the small structures of the cavity core without the wind-induced shear of the large-scale
circulation. A comparison of confined and periodic cases highlights the effect of wind. It is shown
that in the smooth case, heat transfer is independent of the wind presence. Contrary to the common
hypothesis, the increase in heat transfer due to roughness is only partly based on wind-roughness
interactions, and only when roughness emerges above the thermal and viscous boundary layers.
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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