261.
Flame flashback and propagation of premixed flames near a wall
- Kurdyumov, V.; Fernández Tarrazo, Eduardo; Liñán Martínez, Amable
The flashback or propagation of premixed flames along the near-wall low-velocity region at the base of a laminar boundary layer of a reactive mixture has been studied numerically.
262.
Propagation of edge flames in counterflow mixing layers: Experiments and theory
- Santoro, Vito; Liñán Martínez, Amable; Gomez, Alessandro
Edge flames were investigated in a methane/O2/N2 counterflow diffusion flame burner.
263.
Diffusion flame attachment and lift-off in the near wake of a fuel injector
- Fernández Tarrazo, Eduardo; Kurdyumov, V.; Liñán Martínez, Amable
An analysis is presented for the flow, temperature, and concentration fields in the region of attachment of fuel jet diffusion flames, near the wake of the fuel injector, where upstream heat conduction and diffusion are important.
264.
Flame spread over solid fuels in opposite natural convection
- Fernández Tarrazo, Eduardo; Liñán Martínez, Amable
The downward spread of a flame along the surface of a thermally thick solid fuel inclined at an angle to the vertical is investigated, The flow and the heat transfer in the flame front region that controls the spread rate are described numerically using a single-step Arrhenius model for the gas-phase reaction.
265.
Transient ignition and combustion of diluted hydrogen/air mixtures by a thin catalytic wire
- Treviño, C.; Higuera Antón, Francisco; Liñán Martínez, Amable
This paper reports on a study of transient ignition and combustion of hydrogen/air mixtures by a heated, thin catalytic wire in a natural convection environment.
266.
Asymptotic structure of counterflow diffusion flames for large activation energies
- Liñán Martínez, Amable
When the resulting maximum temperature is plotted in terms of the Damkohler number (which is inversely proportional to the flow velocity) the characteristic S curve emerges from the analysis, with segments from the curve resulting from: (a) A nearly frozen ignition regime where the temperature and concentrations deviations from its frozen flow values are small.
267.
Structure of a flame front propagating against the flow near a cold wall
- Kurdyumov, V.; Liñán Martínez, Amable
The flashback or propagation of premixed flames against the flow of a reacting mixture, along the low velocity region near a cold wall, is investigated numerically.
268.
A comparison of computational and experimental lift-off heights of coflow laminar diffusion flames
- Walsh, Kevin T.; Fielding, Joseph; Smooke, Mitchell D.; Long, Marshall B.; Liñán Martínez, Amable
As a sensitive marker of changes in flame structure, the number densities of excited-state CH (denoted CH*), and excited-state OH (denoted OH*) are imaged in coflow laminar diffusion flames.
269.
Combustion theory and modeling
- Buckmaster, J.; Clavin, P.; Liñán Martínez, Amable; Matalon, M.; Peters, N.; Sivashinsky, G.; Williams, F.A.
In honor of the fiftieth anniversary of the Combustion Institute, we are asked to assess accomplishments of theory in combustion over the past fifty years and prospects for the future.
270.
On the dynamics of flame edges in diffusion-flame/vortex interactions
- Hermanns Navarro, Miguel; Vera Coello, Marcos; Liñán Martínez, Amable
We analyze the local flame extinction and reignition of a counterflow diffusion flame perturbed by a laminar vortex ring.
271.
Desarrollo de una aplicación a la detección de aromas para una nariz electrónica del tipo microbalanzas de cristal de cuarzo (QCM) para su adaptación a la determinación de calidad de frutas
- Correa Hernando, Eva Cristina
Los compuestos aromáticos influyen en el olor de la fruta, siendo responsables de la calidad organoléptica del producto.
272.
Ignition of a Reactive Solid Exposed to a Step in Surface Temperature
- Liñán Martínez, Amable; Williams, F.A.
The title problem is classical in ignition theory.
273.
Singular Langmuir-Hinshelwood reaction-diffusion problems. Strong absorption under quasi-isothermal conditions
- Liñán Martínez, Amable; Vega de Prada, José M.
It is known that there may be multiple solutions due to either strong adsorption or external thermal effects; in the first case, an arbitrarily large number of solutions may appear for symmetric pellets in two and three dimensions.
274.
Flames with Chain-Branching/Chain-Breaking Kinetics
- Joulin, G; Liñán Martínez, Amable; Ludford, G. S. S.; Peters, N.; Schmidt-Laine, C.
A steady plane flame subject to the chain-branching/chain-breaking kinetics A plus X yields 2X, 2X plus M yields 2P plus M is considered for a certain distinguished limit of parameter values corresponding to fast recombination.
275.
Structure and stability of flames with two sequential reactions
- Peláez Álvarez, Jesús; Liñán Martínez, Amable
An asymptotic analysis is presented for the structure of steady planar flames, and for their response to nonplanar perturbations, when the reaction mechanism can be modelled by two sequential reactions with the same large value of activation energies.
276.
The effect of square corners on the ignition of solids
- Vázquez Espí, Carlos; Liñán Martínez, Amable
Two spatial zones (reactive and inert) and two time stages (initial and transition) are identified.
277.
Ignition of a rectangular solid by an external heat flux
- Vázquez Espí, Carlos; Liñán Martínez, Amable
The influence of corners on the ignition of a solid exposed to a surface energy flux is analyzed with large activation energy asymptotics.
278.
Chain-branching explosions in mixing layers
- Sánchez Pérez, Antonio Luis; Liñán Martínez, Amable; Williams, F.A.
The chain-branching process leading to ignition in the high-temperature hydrogen-oxygen mixing layer is studied by application of a novel WKB-like method when, as is typically the case, two branching radicals cannot be assumed to maintain steady state.
279.
The coupling of motion and conductive heating of a gas by localized energy sources
- Sánchez Pérez, Antonio Luis; Jiménez Alvárez, Jose Luis; Liñán Martínez, Amable
The problems of plane, line, and point heat sources are all investigated, with a power law for the temperature dependence of the thermal conductivity, after reduction to a quasi-linear heat equation for the temperature.
280.
Relationships between bifurcation and numerical analyses for ignition of hydrogen-air diffusion flames
- Sánchez Pérez, Antonio Luis; Balakrishnan, G.; Liñán Martínez, Amable; Williams, F.A.
Linear bifurcation and numerical techniques are employed to determine critical conditions for ignition in steady, counterflow, nonpremixed hydrogen-air systems, with varying degrees of nitrogen dilution of the fuel, at temperatures larger than the crossover temperature associated with the second explosion limit for hydrogen.
