Thermal transfer in Rayleigh-Bénard convection with and without roughness elements
Résumé
Several Rayleigh-Bénard experiments in water are performed with and without roughness elements. We present new thermal transfer measurements obtained with large roughness elements arranged in a square lattice. The data are compared to previous ones obtained using smaller elements in the same cell. Experiments in the same apparatus without roughness are presented, as reference results in order to allow for comparison. Several regimes of heat transfer, in the rough case, are identified : a regime similar to the smooth case, an enhanced heat transfer one characterized by a modification of the Nusselt vs Rayleigh numbers relation, and a saturation part where the relation can be similar to a smooth one with a corrected prefactor.
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