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INHALTE

Flow structure in a Rayleigh-Bénard cell with rough plate

Julient Salort, ENS Lyon

 

The influence of roughness in turbulent Rayleigh-Bénard convection is investigated

using Particle Image Velocimetry and local temperature measurements,

in several parallelepipedic cells.

Many previous studies have shown that the heat flux is increased when the plate is made rough. 

The increase is larger than the increase of surface area and, may exhibit also an increase of the

scaling exponent. This hints at a change in the boundary layer structure, which we confirmed by 

the analysis of the profiles near the rough plate.

We report new results on the large scale flow structure: the

mean velocity is mostly unchanged by the roughness, but the velocity

fluctuations are increased and the statistics are strongly modified.

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