Results 31 to 40 of about 13,168,725 (351)

Critical conditions for non-symmetric flame propagation in narrow channels: Influence of the flow rate, the thermal expansion, the Lewis number and heat-losses

Combustion and Flame, 2019
This paper presents a numerical study of the propagation of isobaric premixed flames in narrow channels, focusing primarily on the symmetry of solutions.
A. Dejoan, C. Jiménez, V. Kurdyumov
semanticscholar   +1 more source

Towards the Distributed Burning Regime in Turbulent Premixed Flames [PDF]

, 2019
Three-dimensional numerical simulations of canonical statistically-steady statistically-planar turbulent flames have been used in an attempt to produce distributed burning in lean methane and hydrogen flames.
Aspden, A. J., Bell, J. B., Day, M. S.
core   +2 more sources

Effects of Lewis Number on the Evolution of Curvature in Spherically Expanding Turbulent Premixed Flames

Fluids, 2019
The effects of Lewis number on the physical mechanisms pertinent to the curvature evolution have been investigated using three-dimensional Direct Numerical Simulation (DNS) of spherically expanding turbulent premixed flames with characteristic Lewis ...
A. Alqallaf, M. Klein, N. Chakraborty
semanticscholar   +1 more source

A Direct Numerical Simulation Assessment of Turbulent Burning Velocity Parametrizations for Non-Unity Lewis Numbers

Energies, 2023
The predictions of turbulent burning velocity parameterizations for non-unity Lewis number flames have been assessed based on a single-step chemistry Direct Numerical Simulation (DNS) database of premixed Bunsen flames for different values of ...
Vishnu Mohan, Marco Herbert, Markus Klein, Nilanjan Chakraborty   +3 more
doaj   +1 more source

Effects of stoichiometry on premixed flames propagating in narrow channels: symmetry-breaking bifurcations

, 2017
Recent studies within the diffusive-thermal (constant-density) approximation have shown that, for premixed flames freely propagating in narrow adiabatic channels, the instabilities induced by differential diffusion may result in non-symmetric solutions ...
Fernandez-Galisteo, Daniel, Jimenez, Carmen, Kurdyumov, Vadim N., Sanchez-Sanz, Mario   +3 more
core   +1 more source

Stationary convection-diffusion between two co-axial cylinders [PDF]

, 2007
In this note, we examine the high Peclet number limit of the stationary extended Graetz problem for which two families of real and imaginary eigenvalues are associated, respectively, with a downstream convective relaxation and the upstream diffusive ...
Pierre, Charles, Plouraboué, Franck
core   +4 more sources

A Priori Assessment of Algebraic Flame Surface Density Models in the Context of Large Eddy Simulation for Nonunity Lewis Number Flames in the Thin Reaction Zones Regime

Journal of Combustion, 2012
The performance of algebraic flame surface density (FSD) models has been assessed for flames with nonunity Lewis number (Le) in the thin reaction zones regime, using a direct numerical simulation (DNS) database of freely propagating turbulent premixed ...
Mohit Katragadda, Nilanjan Chakraborty, R. S. Cant   +2 more
doaj   +1 more source

Numerical modelling of double-diffusive natural convection within an arc shaped enclosure filled with a porous medium [PDF]

Journal of Heat and Mass Transfer Research, 2014
Numerical study of double-diffusive natural convective heat transfer in a curved cavity filledwith a porous medium has been carried out in the current study. Polar system has beenselected as coordinate system.
Ariyan Zare Ghadi, Ali Haghighi Asl, Mohammad Sadegh Valipour   +2 more
doaj   +1 more source

Transport equations for reaction rate in laminar and turbulent premixed flames characterized by non-unity Lewis number

International journal of hydrogen energy, 2018
Transport equations for (i) the rate W of product creation and (ii) its Favre-averaged value W ˜ are derived from the first principles by assuming that W depends solely on the temperature and mass fraction of a deficient reactant in a premixed turbulent ...
A. Lipatnikov, N. Chakraborty, V. Sabelnikov   +2 more
semanticscholar   +1 more source

Response characteristics of methane–air and propane–air premixed flames to sinusoidal oscillations in equivalence ratio (Effects of Lewis number and preferential diffusion)

Journal of Thermal Science and Technology
Flames propagate in mixture flows with inhomogeneous concentration distributions in practical combustors, such as gasoline direct-injection engines and gas turbine engines. Clarifying the effect of fuel-type differences on the response characteristics of
Yosuke SUENAGA, Hideki YANAOKA, Shohei SEO, Komei NIWATA   +3 more
doaj   +1 more source