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Properties of thermal boundary layer in turbulent Rayleigh-Benard convection

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1030
pages 499-502

A. Maystrenko
Department of Mechanical Engineering, Ilmenau University of Technology, P.0. Box 100565, 98684 Ilmenau, Germany

C. Resagk
Institute of Thermodynamics and Fluid Mechanics, Technische Universität Ilmenau, Am Helmholtzring 1, 98693 Ilmenau, Germany

Andre Thess
Department of Mechanical Engineering, Ilmenau University of Technology, P.0. Box 100565, 98684 Ilmenau, Germany

Abstract

The object of our investigation is the temperature distribution in natural thermal convection using a Rayleigh-Benard experiment. In order to predict the dependence of the thickness and the structure of the thermal boundary layer on the control parameters (constant aspect ratio Γx = 5, Γy = 1 and different Rayleigh numbers) temperature time series and profiles have been measured in the boundary layer under the cooling plate. We present the mean temperature as a function of the distance from the cooling plate with extensive statistical analysis: profiles of the rms temperature fluctuation, skewness and kurtosis.

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