Boundary layers in turbulent Rayleigh-Bénard convection in air

2012/09/27 by Puits, Ronald du, Rilk, Johannes, Resagk, Christian +1
#FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn)

paper · doi:10.48550/arxiv.1209.6201

Abstract

The boundary layer flow in a Rayleigh-Bénard convection cell of rectangular shape has been visualized in this fluid dynamics video. The experiment has been undertaken in air at a Rayleigh number Ra=1.3× 10¹⁰ and a Prandtl number Pr=0.7. Various sequences captured at selected positions of the heating plate show that the boundary layer is a very transient flow region characterized by coherent structures that permanently evolve. It becomes fully turbulent in the areas where the large-scale circulation impinge or leave the bottom plate.

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