Results 231 to 240 of about 190,709 (268)

Heat loss and Lewis number effects on the onset of oscillations in diffusion flames

Symposium (International) on Combustion, 1996
A diffusion flame may be characterized by the response of the burning rate to a properly defined Damkohler number, representing the ratio of diffusion time to chemical reaction time. Depending on the oxidant concentration in the ambient and on the Lewis numbers, the response may be an S-shaped or monotonic curve. While the S curve exhibits ignition and
S. Cheatham, M. Matalon
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An a priori model for the effective species Lewis numbers in premixed turbulent flames

Combustion and Flame, 2014
An a priori model for the effective species Lewis numbers in premixed turbulent flames is presented. This a priori analysis is performed using data from a series of direct numerical simulations (DNS) of lean (ϕ=0.4) premixed turbulent hydrogen flames, with Karlovitz number ranging from 10 to 1562 (Aspden et al., 2011).
Savard, Bruno, Blanquart, Guillaume
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On the effective Lewis number formulations for lean hydrogen/hydrocarbon/air mixtures

International Journal of Hydrogen Energy, 2013
Abstract Decades of research have underlined the undeniable importance of the Lewis number ( Le ) in the premixed combustion field. From early experimental observations on laminar flame propagation to the most recent DNS studies of turbulent flames, the unbalanced influence of thermal to mass diffusion (i.e.
Nicolas Bouvet, Fabien Halter, Christian Chauveau, Youngbin Yoon   +3 more
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Effects of Lewis number on turbulent kinetic energy transport in premixed flames

Physics of Fluids, 2011
The effects of global Lewis number on the statistical behaviour of turbulent kinetic energy transport in turbulent premixed flames are analysed using three-dimensional direct numerical simulation (DNS) data for freely propagating statistically planar flames with Lewis number ranging from 0.34 to 1.2.
Nilanjan Chakraborty, Mohit Katragadda, R. S. Cant   +2 more
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Effect of Damkohler Number and Non-Unity Lewis Number on a Laminar Diffusion Flame

Volume 1: Fora, Parts A, B, C, and D, 2003
The effect of the Damkohler number (Da) and non-unity Lewis number on a two-dimensional, steady, laminar diffusion flame anchored by a dividing plate in a rectangular channel was considered. The governing equations were solved numerically, using the SIMPLE and ADI schemes.
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Effect of unequal fuel and oxidizer Lewis numbers on flame dynamics

International Journal of Thermal Sciences, 2006
The interaction of non-unity Lewis number (due to preferential diffusion and/or unequal rates of heat and mass transfer) with the coupled effect of radiation, chemistry and unsteadiness alters several characteristics of a flame. The present study numerically investigates this interaction with a particular emphasis on the effect of unequal and non-unity
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Body-force effect on the lateral movement of cellular flames at low Lewis numbers

Physical Review E, 2001
The body-force effect on the lateral movement of cellular flames is studied by unsteady calculations of reactive flows at low Lewis numbers. We employ the compressible Navier-Stokes equation including chemical reaction to take account of the hydrodynamic effect caused by thermal expansion.
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Effect of the Lewis number on the flame propagation mechanism

Combustion, Explosion and Shock Waves, 1992
G. A. Zulinyan, G. M. Makhviladze, V. I. Melikhov   +2 more
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Effects of Lewis Number on Spherical Flame Initiation

46th AIAA Aerospace Sciences Meeting and Exhibit, 2008
Zheng Chen, Michael Burke, Yiguang Ju
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Effects of Lewis number on flame ball dynamics

39th Aerospace Sciences Meeting and Exhibit, 2001
M. Abid, K. Aung, D. VanZandt, D. Frate, P. Ronney   +4 more
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