Results 81 to 90 of about 32,275 (199)

Implications of WMAP observations on Li abundance and stellar evolution models

, 2004
The WMAP determination of the baryon-to-photon ratio implies, through Big Bang nucleosynthesis, a cosmological Li abundance larger, by a factor of 2 to 3, than the Li abundance plateau observed in the oldest Pop II stars.
Michaud, Georges, Richard, Olivier, Richer, Jacques   +2 more
core   +4 more sources

Investigation of differential diffusion in lean, premixed, hydrogen-enriched swirl flames

Applications in Energy and Combustion Science
Hydrogen combustion is a promising alternative to fossil fuel combustion in an effort to reduce our carbon footprint. However, hydrogen combustion is prone to thermodiffusive instabilities largely dependent on differential diffusion, a phenomenon that ...
Benjamin Francolini, Luming Fan, Ehsan Abbasi-Atibeh, Gilles Bourque, Patrizio Vena, Jeffrey Bergthorson   +5 more
doaj   +1 more source

Determination of the Burning Velocity Domain of a Statistically Stationary Turbulent Premixed Flame in Presence of Counter-Gradient Transport

Journal of Combustion, 2011
The present study aims at providing a complete picture of the various propagation scenarios that a statistically stationary turbulent premixed flame may possibly undergo.
V. A. Sabel'nikov, P. Bruel
doaj   +1 more source

Chaos and Turbulent Nucleosynthesis Prior to a Supernova Explosion

, 2014
Three-dimensional (3D), time dependent numerical simulations, of flow of matter in stars, now have sufficient resolution to be fully turbulent. The late stages of the evolution of massive stars, leading up to core collapse to a neutron star (or black ...
Arnett, W. David, Meakin, Casey, Viallet, Maxime   +2 more
core   +2 more sources

Implications of Using Scalar Forcing to Sustain Reactant Mixture Stratification in Direct Numerical Simulations of Turbulent Combustion

Computation
A recently proposed scalar forcing scheme that maintains the mixture fraction mean, root-mean-square and probability density function in the unburned gas can lead to a statistically quasi-stationary state in direct numerical simulations of turbulent ...
Peter Brearley, Umair Ahmed, Nilanjan Chakraborty   +2 more
doaj   +1 more source

A Contribution to Turbulent Combustion: Premixed Flames and Material Surfaces Une contribution à la combustion turbulente : flammes prémélangées et surfaces des matériaux

Oil & Gas Science and Technology, 2006
The behavior of premixed flames has been examined by many authors. In fact the problem of combustion which develops in a turbulent medium depends on two scalings.
Nicolleau F., Bertoglio J. P., Mathieu J.   +2 more
doaj   +1 more source

The core helium flash revisited: II. Two and three-dimensional hydrodynamic simulations

, 2008
We study turbulent convection during the core helium flash close to its peak by comparing the results of two and three-dimensional hydrodynamic simulations.
Kifonidis, K., Mocak, M., Mueller, E., Weiss, A.   +3 more
core   +2 more sources

Conditional Moment Closure Modelling of a Lifted H2/N2 Turbulent Jet Flame Using the Presumed Mapping Function Approach

Journal of Combustion, 2015
A lifted hydrogen/nitrogen turbulent jet flame issuing into a vitiated coflow is investigated using the conditional moment closure (CMC) supplemented by the presumed mapping function (PMF) approach for the modelling of conditional mixing and velocity ...
Ahmad El Sayed, Roydon A. Fraser
doaj   +1 more source

The Effect of Jet-Induced Disturbances on the Flame Characteristics of Hydrogen–Air Mixtures

Fire
To mitigate explosion hazards arising from hydrogen leakage and subsequent mixing with air, the injection of inert gases can substantially diminish explosion risk. However, prevailing research has predominantly characterized inert gas dilution effects on
Xinyu Chang, Mengyuan Ge, Kai Wang, Bo Zhang, Sheng Xue, Yu Sun   +5 more
doaj   +1 more source

Investigation of Numerical Effects on the Flow and Combustion in LES of ICE

Oil & Gas Science and Technology, 2017
This work investigates the influence of numerical dissipation on the modeled combustion in Large Eddy Simulations (LES). It is well known that capturing the dynamics of the in-cylinder flow is crucial for engine simulations, as it strongly affects flame ...
Nguyen Thuong, Kempf Andreas Markus
doaj   +1 more source