Europhys. Lett.
Volume 48, Number 1, October 1999
Page(s) 43 - 48
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 01 September 2002
DOI: 10.1209/epl/i1999-00111-0

Europhys. Lett, 48 (1), pp. 43-48 (1999)

Reynolds number dependence of low-order turbulent temperature structure functions

R. A. Antonia, G. Xu and T. Zhou

Department of Mechanical Engineering
University of Newcastle - N.S.W., 2308, Australia

(received 23 February 1999; accepted in final form 8 August 1999)

PACS. 47.15Gf - Low-Reynolds-number (creeping) flows.


The behaviour of low-order moments of the temperature increment $\delta\theta \equiv$
$ \theta(x+r)-\theta(x)$ is considered, for both a range of flows and of the Taylor microscale Reynolds number $R_{\lambda}$. The focus is on values of the separation r which are either large compared to the integral length scale or lie within the inertial range. In the former case, the dependence on $R_{\lambda}$appears to be reasonably well predicted, provided the velocity/temperature time scale ratio is taken into account. In the latter case, the prediction, based on local isotropy, appears to be approached only at sufficiently large $R_{\lambda}$.


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