Volume 69, Number 1, January 2005
|Page(s)||75 - 80|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||08 December 2004|
Logarithmically modified scaling of temperature structure functions in thermal convection
International Center for Theoretical Physics - Strada Costiera 11, 34100 Trieste, Italy
2 ICAR - P.O. Box 31155, Jerusalem 91000, Israel
Accepted: 3 September 2004
Using experimental data on thermal convection, obtained at a Rayleigh number of 1.5 , it is shown that the temperature structure functions , where is the absolute value of the temperature increment over a distance r, can be well represented in an intermediate range of scales by , where the are the scaling exponents appropriate to the passive scalar problem in hydrodynamic turbulence and the function . Measurements are made in the midplane of the apparatus near the sidewall, but outside the boundary layer.
PACS: 47.27.Te – Convection and heat transfer / 47.27.Jv – High-Reynolds-number turbulence
© EDP Sciences, 2005
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