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Effects of Lewis number on scalar transport in turbulent premixed flames
Physics of Fluids, 2009The effects of global Lewis number on scalar transport in turbulent premixed flames are studied using direct numerical simulation. Under the same initial conditions of turbulent flow field, it is observed that flames with global Lewis numbers significantly smaller than unity tend to exhibit countergradient transport, whereas the extent of gradient ...
Chakraborty N, Cant RS
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Effects of Lewis number on heat and mass transfer in a triangular cavity
International Communications in Heat and Mass Transfer, 2012Abstract The double-diffusive mixed convection in a right triangular is analyzed by solving the mass, momentum, energy and concentration balance equations. The flow is considered to operate in the laminar regime under steady state conditions. Moreover, Galerkin weighted residuals finite element method is applied to solve the governing equations.
M. Hasanuzzaman +4 more
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An analysis of lewis number and flow effects on the ignition of premixed gases
Symposium (International) on Combustion, 1988We have analysed numerically the ignition of a combustible gas to which heat is added over a specified period at a spherical boundary of small diameter. We solve conservation equations for reactant and sensible enthalpy and allow the gas to undergo a one step chemical reaction.
P.S. Tromans, R.M. Furzeland
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A mathematical model for pyrolysis of a solid particle: Effects of the lewis number
The Canadian Journal of Chemical Engineering, 1977AbstractA transient analysis of a fluid‐solid pyrolysis system in which a solid is pytolyzed to form a fluid product and a solid product is presented. The analysis, based on utilization of the so‐called volume reaction model, takes into account the simultaneous heat and mass transfer phenomena in the particle being pyrolyzed.
L. T. Fan +4 more
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Effects of Fuel Lewis Number on Localised Forced Ignition of Turbulent Mixing Layers
Flow, Turbulence and Combustion, 2009zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Chakraborty N, Hesse H, Mastorakos E
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Revisiting effective Lewis number of combustible mixtures
Fuel, 2023Lu-Qing Wang, Yun Ge, Hong-Hao Ma
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Heat loss and Lewis number effects on the onset of oscillations in diffusion flames
Symposium (International) on Combustion, 1996A 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, 2014An 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, 2013Abstract 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 +3 more
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Effects of Lewis number on turbulent kinetic energy transport in premixed flames
Physics of Fluids, 2011The 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 +2 more
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