Results 261 to 270 of about 128,331 (304)
Some of the next articles are maybe not open access.
Premixed flame propagation in an optically thick gas
AIAA Journal, 1993Flame propagation in both the optically thin and the optically thick regime of radiative transport was studied experimentally using particle-laden gas mixtures. Data on flame shapes, propagation rates, peak pressure, maximum rate of pressure rise, and thermal decay in the burned gases are consistent with the hypothesis that, at low particle loadings ...
Angel Abbud-Madrid, Paul D. Ronney
openaire +1 more source
Velocity of weakly turbulent flames of finite thickness
Combustion Theory and Modelling, 2005The velocity increase of a weakly turbulent flame of finite thickness is investigated using analytical theory developed in previous papers.
V. Akkerman, V. Bychkov
openaire +1 more source
An assessment of stretch effects on a flame tip using the thin flame and thick flame formulations
Combustion and Flame, 2003Flames are stretched due to the interactions between nonuniform flow along the flame, flamefront curvature, and flame motion. Variations in the stretch rate induce local variations in the flame temperature and the mass burning rate. Williams defined flame stretch as the fractional rate of change of an area element on a flame surface [1].
Achintya Mukhopadhyay, Ishwar K Puri
openaire +1 more source
Gravitational effects on flames spreading over thick solid surfaces
Acta Astronautica, 1985A theoretical model for the downward spread of a flame in the gas over a semi-infinitely thick fuel bed is presented. Gas-phase chemistry is assumed to proceed at an infinite rate while the fuel bed is taken to pyrolyze at the surface in an Arrhenius fashion. Spread rates and flame shapes are computed for two different ambient oxygen concentrations for
M. Vedha-Nayagam, Robert A. Altenkirch
openaire +1 more source
Turbulent scales smaller than the flame thickness
Physical Review E, 1999We study in this paper the effect of turbulent scales smaller than the premixed flame thickness on flame propagation and structure. We compare our numerical results to existing theories of flame broadening, showing that the apparent Lewis number tends to unity for very high forcings, but that the small scale forcing can generate a large-scale curvature
openaire +1 more source
Correlating Downward Flame Spread Rates for Thick Fuel Beds
Combustion Science and Technology, 1983Flame spread rates are presented for polymethylmethacrylate fuel beds as a function of gravitational acceleration and ambient pressure and oxygen concentration. The data are correlated by plotting a dimensionless spread rate that is a measure of the heat transferred forward of the flame, required to sustain the flame, compared to the maximum possible ...
R. A. ALTENKIRCH +2 more
openaire +1 more source
Flame spread along thermally thick horizontal rods
Combustion Theory and Modelling, 2002An analysis is carried out of the spread of a flame along a horizontal solid fuel rod, for which a weak aiding natural convection flow is established in the underside of the rod by the action of the axial gradient of the pressure variation that gravity generates in the warm gas surrounding the flame.
openaire +1 more source
Investigation of Light Interaction With Transient Expanding Thick Flames
Energy Conversion and Resources: Fuels and Combustion Technology, Energy, Nuclear Engineering, and Solar Engineering, 2003Optical behavior of spherical flames has been investigated using Shadowgraph method. A mathematical model has been developed to predict the intensity profile of refracted light beams interacting with a transient expanding thick flame. Experimental facilities have been built to visualize transient expanding spherical flames.
Farzan Parsinejad, Hameed Metghalchi
openaire +1 more source
Enhanced Ethanol Selectivity of Flame-Spray-Made Au/ZnO Thick Films
Journal of Nanoscience and Nanotechnology, 2014Sensing characteristics of the spin-coated Au/ZnO nanoparticles thick films with different Au concentrations have been studied for various gases, namely, CO, SO2, ethanol and acetone. The influence on a dynamic range of Au concentration on ethanol response (0.005-0.1 vol.%) of thick film sensor elements was studied at the operating temperatures ranging
V, Kruefu +2 more
openaire +2 more sources
Applied Thermal Engineering, 2019
Abstract The effect of Darrieus-Landau (DL) instability on flame topology and brush thickness was systematically investigated on a planar and Bunsen flame, with the latter used for direct comparison with experimental results from PLIF technique. For planar flame, the flame brush thickness significantly increases with turbulence intensity v ′
Meng Zhang +3 more
openaire +1 more source
Abstract The effect of Darrieus-Landau (DL) instability on flame topology and brush thickness was systematically investigated on a planar and Bunsen flame, with the latter used for direct comparison with experimental results from PLIF technique. For planar flame, the flame brush thickness significantly increases with turbulence intensity v ′
Meng Zhang +3 more
openaire +1 more source