Mean velocity profile in confined turbulent convection
Puits, R., Resagk, C. and Thess, A.
2007 Phys. Rev. Lett. 99, 234504
Puits, R., Resagk, C. and Thess, A., (2007), "Mean velocity profile in confined turbulent convection", Phys. Rev. Lett. 99, 234504.
Abstract:
In this Letter, highly resolved measurements of the horizontal velocity inside the boundary layer of turbulent Rayleigh-B¨Śnard convection are reported. They were performed in a cylindrical box with an aspect ratio Gamma=1.13 which was filled with air with a Prandtl number Pr=0.7. The horizontal velocity was measured along the central axis close to the cooling plate in a range of Rayleigh numbers between Ra=1011 and Ra=1012 using a two-dimensional laser Doppler velocimeter. We demonstrate that the profile of the mean velocity strongly differs from that of classical shear flows like the Blasius shape of a laminar flat plate boundary layer or a turbulent logarithmic velocity profile with standard coefficients.
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