Results 11 to 20 of about 13,168,725 (351)
Effects of Lewis number on the statistics of the invariants of the velocity gradient tensor and local flow topologies in turbulent premixed flames [PDF]
Proc Math Phys Eng Sci, 2018 The behaviours of the three invariants of the velocity gradient tensor and the resultant local flow topologies in turbulent premixed flames have been analysed using three-dimensional direct numerical simulation data for different values of the ...
D. Wacks +2 more
semanticscholar +2 more sources
Lewis number effects in distributed flames [PDF]
Proceedings of the Combustion Institute, 2011 Abstract Recent computational studies have simulated a mode of distributed premixed combustion where turbulent mixing plays a significant role in the transport of mass and heat near the reaction zone. Under these conditions, molecular transport processes play a correspondingly smaller role.
Aspden, Andrew, Day, M., Bell, J.
openaire +3 more sources
Characterization of low Lewis number flames [PDF]
Proceedings of the Combustion Institute, 2011 Abstract A recent numerical study of turbulence–flame interactions in lean premixed hydrogen, where the Lewis number was approximately 0.36, observed that flames at different equivalence ratios presented significantly different behavior despite having the same Karlovitz and Damkohler numbers.
Aspden, Andrew, Day, M., Bell, J.
openaire +3 more sources
Strained Premixed Laminar Flames with Nonunity Lewis Numbers [PDF]
Combustion Science and Technology, 1983 The method of activation energy asymptotics is used to study the effects of Lewis numbers different from unity on nonadiabatic flamelets in counterflowing streams of reactants and products. A sequence of analyses parallels those reported earlier for such flamelets having Lewis number unity.
Libby, Paul A. +2 more
openaire +2 more sources
Lewis Number Effects on Flame Speed Statistics in Spherical Turbulent Premixed Flames
Flow Turbulence and Combustion, 2020 The influences of characteristic Lewis number $$ \hbox{Le} $$ Le on the statistics of density-weighted displacement speed and consumption speed in spherically expanding turbulent premixed flames have been analysed using three-dimensional direct numerical
G. Ozel-Erol, M. Klein, N. Chakraborty
semanticscholar +1 more source
Experimental Study on Local Flame Properties of Hydrogen Added Hydrocarbon Premixed Turbulent Flames
Journal of Thermal Science and Technology, 2009 This experimental study is performed to investigate directly the local flame properties of turbulent propagating flames at the same weak turbulence condition (u'/SL0=1.4), in order to clarify basically the influence of the addition of hydrogen to ...
Masaya NAKAHARA +2 more
doaj +1 more source
An Analysis of Local Quantities of Turbulent Premixed Flames Using DNS Databases
Journal of Thermal Science and Technology, 2008 A numerical analysis was performed using DNS (Direct Numerical Simulation) databases of statistically steady and fully developed turbulent premixed flames with different density ratios and with different Lewis numbers.
Kazuya TSUBOI +2 more
doaj +1 more source
Linear stability of planar premixed flames: reactive Navier-Stokes equations with finite activation energy and arbitrary Lewis number [PDF]
, 2003 A numerical shooting method for performing linear stability analyses of travelling waves is described and applied to the problem of freely propagating planar premixed flames.
Dold J +14 more
core +1 more source
Effect of Stretch on Local Burning Velocity of Premixed Turbulent Flames
Journal of Thermal Science and Technology, 2007 The effect of positive stretch on the local flame properties of turbulent propagating flames in the flamelet regime was investigated experimentally for methane-, hydrogen- and propane-air mixtures with lean and rich having nearly the same laminar burning
Masaya NAKAHARA +3 more
doaj +1 more source
South African Journal of Chemical Engineering, 2022 Double diffusive flow under mixed convection has become a significant area of research. This study aims to evaluate the Lewis number effect in such a double-diffusive problem in a roof-based air-ventilated system.
C.N. Mithun +4 more
doaj +1 more source