NDLI: Transition from Countergradient to Gradient Scalar Transport in Developing Premixed Turbulent Flames

Content Provider	Springer Nature Link
Author	Lipatnikov, A. N. Sabelnikov, V. A.
Copyright Year	2012
Abstract	A simple model of turbulent scalar flux developed recently by the present authors is applied to determine the direction of the flux in a statistically planar one-dimensional premixed flame that does not affect turbulence and has self-similar mean structure. Results obtained in the case of statistically stationary turbulence indicate that transition from countergradient to gradient turbulent scalar transport may occur during flame development, as the peak mean rate of product creation moves to the trailing edge of the flame brush. In the case of decaying turbulence, the opposite transition (from gradient to countergradient transport) was simulated in line with available DNS data. In both cases, transition instant depends strongly on turbulence and mixture characteristics. In particular, countergradient transport is suppressed by an increase in the rms turbulent velocity and by a decrease in the laminar flame speed or density ratio, in line with available experimental and DNS data. The obtained results lend qualitative support to the model of turbulent scalar flux addressed in the present work.
Ending Page	418
Page Count	18
Starting Page	401
File Format	PDF
ISSN	13866184
e-ISSN	15731987
Journal	Flow, Turbulence and Combustion
Issue Number	2
Volume Number	90
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-11-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fluid- and Aerodynamics Countergradient scalar transport Premixed turbulent combustion Engineering Thermodynamics, Heat and Mass Transfer Engineering Fluid Dynamics Automotive Engineering Combustion Turbulent transport, mixing Modeling
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry Chemical Engineering

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