Results 251 to 260 of about 82,402 (301)
Some of the next articles are maybe not open access.
Localized Flickering Cellular Flames
SIAM Journal on Applied Mathematics, 1998Summary: We illustrate the formation and evolution of cellular flames described by localized, ordered solutions of a modified Kuramoto-Sivashinsky equation (MKSE) derived for flames stabilized on a burner. The MKSE equation accounts for a slight curvature of the flat front due to the slowing of the gas flow near the burner rim.
Class, A., Bayliss, A., Matkowsky, B. J.
openaire +2 more sources
Cellular and Tulip Flame Configurations
Journal of Applied Mechanics and Technical Physics, 2003Flame propagation in a plane channel with the formation of tulip and cellular configurations of the combustion front is simulated. The near-flame flow structure and the thermal flow structure are determined. An analogy is found between the tulip configuration and flame inflections at cell interfaces.
Istratov, A. G. +2 more
openaire +2 more sources
A Nonlinear Theory of Cellular Flames
SIAM Journal on Applied Mathematics, 1980Experiments with laminar flames in gaseous combustible mixtures show that for certain mixtures a flame front will often break up into numerous cells. Cellular flames are periodic structures with pointed crests, pointing in the direction of the burned gas. The smoother sections (troughs) of the front are convex toward the fresh mixture.
Matkowsky, B. J. +2 more
openaire +1 more source
Nonlinear Dynamics of Cellular Flames
SIAM Journal on Applied Mathematics, 1992The problem of a flame stabilized by a line source of fuel in the cellular regime, i.e., $L < 1$,where L is the Lewis number, is solved numerically. It is found that as L is decreased, transitions from stationary axisymmetric to stationary cellular to nonstationary cellular flames occur.
Bayliss, Alvin, Matkowsky, Bernard J.
openaire +2 more sources
Flame Propagation in Vertical Channels: Bifurcation to Bimodal Cellular Flames
SIAM Journal on Applied Mathematics, 1984We derive a nonlinear evolution equation and associated boundary conditions which, under certain circumstances, describe downward adiabatic flame propagation in long, vertical channels. We analyze this problem for the case of axial symmetry and show that there exist two critical parameters, the channel radius R and a gravitational acceleration ...
Margolis, Stephen B. +1 more
openaire +1 more source
Wrinkled flames and cellular patterns
ACM SIGGRAPH 2007 papers, 2007We model flames and fire using the Navier-Stokes equations combined with the level set method and jump conditions to model the reaction front. Previous works modeled the flame using a combination of propagation in the normal direction and a curvature term which leads to a level set equation that is parabolic in nature and thus overly dissipative and ...
Jeong-Mo Hong +2 more
openaire +1 more source
A cellular automata model for expanding turbulent flames
Chaos: An Interdisciplinary Journal of Nonlinear Science, 2020Cellular automata models based on population dynamics, introduced by Von Neumann in the 1950s, has been successfully used to describe pattern development and front propagation in many applications, such as crystal growth, forest fires, fractal growth in biological media, etc.
Vishnu R. Unni +2 more
openaire +2 more sources
Analyzing the dynamics of cellular flames
Physica D: Nonlinear Phenomena, 1996Abstract Video data from experiments on the dynamics of two-dimensional flames are analyzed. The Karhumen-Loeve (KL) analysis is used to identify the dominant spatial structures and their temporal evolution fot several dynamical regimes of the flames. A data analysis procedure to extract and process the boundaries of flame cells is described.
Antonio Palacios +3 more
openaire +1 more source
On Disintegration of Cellular Flames
2003A three-dimensional reaction-diffusion model for premixed flames with radiative heat losses is studied numerically. In accordance with previous analytical predictions and two-dimensional numerical simulations, it is shown that cellular flames occurring in low Lewis number premixtures can propagate at heat-loss rates greater than the maximum that ...
Leonid Kagan +2 more
openaire +1 more source
On the hexagonal structure of cellular flames
Canadian Journal of Physics, 1990The effect of hexagonal pattern formation in steady spherical flames is studied both analytically and numerically. It is shown that the hexagonal cells emerge as a subcritical bifurcation from the basic state provided the flame radius exceeds a certain critical value.
Shtilman, L., Sivashinsky, G.
openaire +1 more source