3-d Measurements of the Velocity in the Boundary Layer of Turbulent Convection
In our contribution we present local velocity measurements inside the boundary layers in turbulent Rayleigh-Bénard convection. The experiments were conducted at a Rayleigh number Ra = 2.88 × 1010 a Prandtl number Pr = 0.7 and an aspect ratio Γ = 1. The goal of this work was to create a set of reference data to compare it with recently performed numerical simulations at the same parameter range. Our measurements have shown that the profile of themean horizontal velocity differs from the prediction of a laminar isothermal boundary layer and that thermal plumes create a significant wall-normal component of the velocity.
KeywordsBoundary Layer Rayleigh Number Horizontal Velocity Laser Doppler Anemometry Turbulent Convection
Unable to display preview. Download preview PDF.
- 3.Belmonte, A., Tilgner, A., Libchaber, A.: Temperature and velocity boundary layers in turbulent convection. Phys. Rev. 50, 269 (1994)Google Scholar
- 5.du Puits, R., Resagk, C., Thess, A.: Structure of viscous boundary layers in turbulent Rayleigh-Bénard convection. Phys. Rev. 80, 036318 (2009)Google Scholar