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• W2949660423 abstract "We report Particle Image Velocimetry of the Large Scale Circulation and the viscous boundary layer in turbulent thermal convection. We use two parallelepipedic Rayleigh-B{'e}nard cells with a top smooth plate. The first one has a rough bottom plate and the second one has a smooth one so we compare the rough-smooth and the smooth-smooth configurations. The dimensions of the cell allow to consider a bi-dimensional mean flow. Lots of previous heat flux measurements have shown a Nusselt--Rayleigh regime transition corresponding to an increase of the heat flux in presence of roughness which is higher than the surface increase. Our velocity measurements show that if the mean velocity field is not clearly affected by the roughness, the velocity fluctuations rise dramatically. It is accompanied by a change of the longitudinal velocity structure functions scaling. Moreover, we show that the boundary layer becomes turbulent close to roughness, as it was observed recently in the air [Liot et al., JFM, vol. 786, pp. 275-293]. Finally we discuss the link between the change of the boundary layer structure and the ones observed on the Large Scale Circulation." @default.
• W2949660423 created "2019-06-27" @default.
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• W2949660423 date "2017-04-26" @default.
• W2949660423 modified "2023-09-23" @default.
• W2949660423 title "Velocity fluctuations and boundary layer structure in a rough Rayleigh-Bénard cell filled with water" @default.
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• W2949660423 doi "https://doi.org/10.1103/physrevfluids.2.044605" @default.
• W2949660423 hasPublicationYear "2017" @default.
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