281.
Simplified approach to the numerical description of methane-air diffusion flames
- Bollig, M.; Liñán Martínez, Amable; Sánchez Pérez, Antonio Luis; Williams, F.A.
Starting with a three-step reduced chemistry description that employes H2 and CO as the only intermediates not in steady state, a simplified formulation aimed at facilitating numerical computations of non-premixed methane-air systems is developed.
282.
Vortex-induced extinction behavior in methanol gaseous flames: A comparison with quasi-steady extinction
- Santoro, Vito S.; Kyritsis, D.C.; Liñán Martínez, Amable; Gomez, Alessandro
Using a combination of HCHO planar laser-induced fluorescence and laser Doppler velocimetry measurements, the extinction behavior of methanol counterflow diffusion flames was examined experimentally under conditions in which the extinction was brought about by a vortex generated on the oxidizer side.
283.
The anchoring of gaseous jet diffusion flames in stagnant air
- Kurdyumov, V.; Fernández Tarrazo, Eduardo; Liñán Martínez, Amable
A numerical analysis is presented to describe the structure of the attachment region of gaseous jet diffusion flames in stagnant air.
284.
Autoignition of hydrogen/air mixtures by a thin catalytic wire
- Treviño, C.; Liñán Martínez, Amable; Kurdyumov, V.
The autoignition of the catalytic reaction of hydrogen/air mixtures on thin palladium wires is analyzed in this paper.
285.
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.
286.
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.
287.
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.
288.
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.
289.
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.
290.
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.
291.
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.
292.
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.
293.
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.
294.
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.
295.
Estudios sobre factores cinéticos implicados en la litiasis renal oxalocálcica: nucleación heterogénea e inhibidors de la cristalización
- Isern Amengual, Bernat
Resum
La tesi realitzada planteja un estudi en profunditat de diferents factors que poden estar implicats en la formació dels càlculs renals, especialment els oxalo-càlcics que representen aproximadament un 70 % del total.
296.
Gasification effects in the heterogeneous ignition of a condensed fuel by a hot gas
- Kindelan Gómez, Manuel; Liñán Martínez, Amable
An analysis is presented to describe the heterogeneous ignition of a condensed fuel suddenly exposed to a hot oxidizing atmosphere.
297.
Técnicas de perturbaciones singulares en la teoría de reactores catalíticos
- Vega de Prada, Jose Manuel; Liñán Martínez, Amable
Se analiza el problema de transporte de calor y masa en partículas porosas de geometrías simétricas (placas, cilindros y esferas) en cuyo interior tiene lugar una reacción catalítica de tipo Arrhenius o Langmuir-Hinshelwood, teniendo en cuenta los efectos de las resistencias al transporte externo de calor y masa.
298.
Radiant ignition of a reactive solid with in-depth absorption
- Liñán Martínez, Amable; Williams, F.A.
It is shown that as » increases, the structure of the transition stage, which follows the inert heat-conduction stage, passes from a thermal explosion without heat conduction, to a single transient heat-conduction zone with distributed chemical heat release, to a two-zone structure composed of a reactive-diffusive-absorptive zone near the surface and a transient-diffusive zone in the interior.
299.
A Theoretical Analysis of Premixed Flame Propagation with an Isothermal Chain Reaction
- Liñán Martínez, Amable
An asymptotic analysis, for large activation energies, is presented of the structure of a deflagration wave supported by a two step chemical reaction mechanism with a first order chain-branching reaction and a second order chain termination reaction.
300.
On diffusive supersonic combustion (Chemical kinetic effects in diffusive supersonic combustion)
- Liñán Martínez, Amable; Urritia, J.L.; Fraga, E.
Three different regions are shown to occur in supersonic diffusive combustion.
