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Density fluctuation correlations in free turbulent binary mixing

Chassaing, Patrick and Harran, Gilles and Joly, Laurent Density fluctuation correlations in free turbulent binary mixing. (1994) Journal of Fluid Mechanics, vol. 2 . pp. 239-278. ISSN 0022-1120

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Official URL: http://dx.doi.org/10.1017/S0022112094003903

Abstract

This paper is devoted to the analysis of the turbulent mass flux and, more generally, of the density fluctuation correlation (d.f.c.) effects in variable-density fluid motion. The situation is restricted to the free turbulent binary mixing of an inhomogeneous round jet discharging into a quiescent atmosphere. Based on conventional (Reynolds) averaging, a ternary regrouping of the correlations occurring in the statistical averaging of the open equations is first introduced. Then an exact algebraic relationship between the d.f.c. terms and the second-order moments is demonstrated. Some consequences of this result on the global behaviour of variable-density jets are analytically discussed. The effects of the d.f.c. terms are shown to give a qualitative explanation of the influence of the ratio of the densities of the inlet jet and ambient fluid on the centerline decay rates of mean velocity and mass fraction, the entrainment rate and the restructuring of the jet. Finally, the sensitivity of second-order modelling to the d.f.c. terms is illustrated and it is suggested that such terms should be considered as independent variables in the closing procedure.

Item Type:Article
Additional Information:Thanks to Cambridge University Press. The original PDF can be found on the Cambridge University Press website : http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=353438
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Laurent JOLY
Deposited On:21 Apr 2009 13:22

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