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The boundary layer flow in a Rayleigh-B\'enard convection cell of rectangularshape has been visualized in this fluid dynamics video. The experiment has beenundertaken in air at a Rayleigh number $Ra=1.3\times 10^{10}$ and a Prandtlnumber $Pr=0.7$. Various sequences captured at selected positions of theheating plate show that the boundary layer is a very transient flow regioncharacterized by coherent structures that permanently evolve. It becomes fullyturbulent in the areas where the large-scale circulation impinge or leave thebottom plate.

Boundary layers in turbulent Rayleigh-B\'enard convection in air