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Published in:
2010 | OriginalPaper | Chapter
Asymmetries in Turbulent Rayleigh-Bénard Convection
Authors : Ronald du Puits, Christian Resagk, André Thess
Published in: Progress in Turbulence III
Publisher: Springer Berlin Heidelberg
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We report high-resolution local temperature measurements in the upper and the lower boundary layer of turbulent Rayleigh–Bénard (RB) convection. The measurements were undertaken in air (
Pr
= 0.71) at constant aspect ratio Γ= 1.13 and variable Rayleigh number 5×10
5
<
Ra
< 10
12
. The primary purpose of the work is to preserve a comprehensive data set of the temperature field against which various phenomenological theories and numerical simulations can be tested. In our talk we show the mean temperature profiles
ϑ
h
(
z
) at the heating and
ϑ
c
(
z
) at the cooling plate. We demonstrate, that the corresponding profiles do not collapse even at low Rayleigh numbers and that the measured bulk temperature
ϑ
b
strongly deviates from the mean between the heating and the cooling plate
ϑ
b
,
t
. Normalizing all temperatures to the difference between the plates, the deviation remains constant for all
Ra
> 2×10
11
.