Results 221 to 230 of about 190,709 (268)
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Effect of Lewis number on flame propagation through vortical flows
Combustion and Flame, 2005The premixed gas flame spreading through an array of large-scale vortices is studied numerically. It is found that the flame speed is a nonmonotonic function of the stirring intensity. At sufficiently low Lewis numbers (Le 1. At Le 1 the deficient reactant is fully consumed up to the very quenching point.
L. Kagan, G. Sivashinsky
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Numerical simulations of Lewis number effects in turbulent premixed flames
Journal of Fluid Mechanics, 1992The structure of a premixed flame front propagating in a region of two-dimensional turbulence is investigated using full numerical simulation including heat release, variable properties, and one-step Arrhenius chemistry. The influence of reactant Lewis number (Le = ratio of thermal to species diffusivity) is reported for Le = 0.8, Le = 1.0, and Le = 1 ...
D. C. Haworth, T. J. Poinsot
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Effects of Lewis numbers and kinetics on spontaneous ignition of hydrogen jets
Proceedings of the Combustion Institute, 2017Abstract The transient process following a hydrogen leak into the atmosphere initiates as a contact surface appears separating air heated by the leading shock from hydrogen cooled by expansion. Diffusion of heat and species produces reactive mixture, potentially leading to ignition.
E. Bourgin +4 more
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Lewis number effect on the propagation of premixed flames in closed tubes
Combustion and Flame, 1992The evolution of a premixed flame under conditions of confinement is studied theoretically. The analysis is based on a hydrodynamic model in which the flame is treated as a surface of discontinuity. The flame structure is assumed to be quasi-steady with a high activation energy and a large heat release.
J.L. Mcgreevy, M. Matalon
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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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