Laminar flow between parallel plates with injection of a reactant at high reynolds number

Seshadri, K.; Williams, F. A.

doi:10.1016/0017-9310(78)90230-2

Cited by 376 publications

(119 citation statements)

References 9 publications

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“…Several alternatives exist to approximate the free-stream in an OFDF apparatus [7-9J. Since the fuel velocity at the pyro1yzing surface is much less than the oxidant nozzle velocity, only au lax is of 00 importance [9] and the development which follows applies to all alternatives with u linearly dependent on x. Near the surface, viscous, blowing …”

Section: Pyrolysis Regionmentioning

confidence: 99%

Opposed flow diffusion flame extensions

Kinoshita

Pagni

Beier

1981

Symposium (International) on Combustion

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Section: Pyrolysis Regionmentioning

confidence: 99%

Opposed flow diffusion flame extensions

Kinoshita

Pagni

Beier

1981

Symposium (International) on Combustion

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“…where (r1, r2) are the gas densities at the jet exits [15]. Only U (not r) was changed to vary s because changing r would require changing the mixture which would substantially affect the other properties (a, SL, etc.)…”

Section: Experimental Apparatusmentioning

confidence: 99%

Propagation and extinction of premixed edge-flames

Clayton

Suk

Ronney

2019

Proceedings of the Combustion Institute

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The propagation rates (Uedge) of edge-flames in premixed hydrocarbon-oxygen-inert mixtures were measured as a function of global strain rate (σ), mixture strength, and (by changing fuel and inert type) Lewis number (Le). Using a counterflow slot-jet burner with electrical heaters at both ends to anchor the flame edges, both advancing (positive Uedge) and retreating (negative Uedge) edge-flames were characterized. Results are presented for both twin (premixed gas against premixed gas) and single (premixed gas against cold inert gas) edge-flames in terms of the effects of a non-dimensional strain rate (e) and non-dimensional heat loss (k) on a scaled propagation rate. Uedge showed a strong dependence on Le and flames images show that high (low) Le lead to weaker (stronger) edge-flame burning intensity. Uedge for single edge-flames scaled with the square root of the unburned to burned gas density ratio in a manner similar to nonpremixed flames whereas for premixed flames Uedge scaled linearly with density ratio. Edge-flames exhibited two extinction limits corresponding to a high-σ strain induced limit and a low-σ heat loss induced limit; a simple description of the low-σ limits was proposed and found to correlate well with experiments in twin-premixed, single-premixed, and nonpremixed edge-flames over more than a two-decade range of k. Results are in good qualitative and reasonable quantitative agreement with simple theories except that retreating twin edge-flames in high-Le mixtures are predicted theoretically but were not observed experimentally.

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“…Equation 1 is obtained from an asymptotic theory where the Reynolds numbers of the laminar flow at the boundaries are presumed to be large [8]. The onset of ignition is observed using a high-speed camera to make sure that ignition takes place close to the axis of symmetry.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…The value of the strain rate, defined as the normal gradient of the normal component of the flow velocity, changes from the fuel boundary to the oxidizer boundary [8]. The characteristic strain rate on the air side of the stagnation plane a 2 is presumed to be given by [8] …”

Section: Introductionmentioning

confidence: 99%

Experimental and kinetic modeling study of extinction and ignition of methyl decanoate in laminar non-premixed flows

Seshadri

Herbinet

et al. 2009

Proceedings of the Combustion Institute

131

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Methyl decanoate is a large methyl ester that can be used as a surrogate for biodiesel. In this experimental and computational study, the combustion of methyl decanoate is investigated in nonpremixed, nonuniform flows. Experiments are performed employing the counterflow configuration with a fuel stream made up of vaporized methyl decanoate and nitrogen, and an oxidizer stream of air. The mass fraction of fuel in the fuel stream is measured as a function of the strain rate at extinction, and critical conditions of ignition are measured in terms of the temperature of the oxidizer stream as a function of the strain rate. It is not possible to use a fully detailed mechanism for methyl decanoate to simulate the counterflow flames because the number of species and reactions is too large to employ with current flame codes and computer resources. Therefore a skeletal mechanism was deduced from a detailed mechanism of 8555 elementary reactions and 3036 species using ``directed relation graph'' method. This skeletal mechanism has only 713 elementary reactions and 125 species. Critical conditions of ignition were calculated using this skeletal mechanism and are found to agree well with experimental data. The predicted strain rate at extinction is found to be lower than the measurements. In general, the methyl decanoate mechanism provides a realistic kinetic tool for simulation of biodiesel fuels. Experimental and Kinetic Modeling Study of Extinction and Ignition of Methyl Decanoate in Laminar Nonpremixed Flows Experimental and Kinetic Modeling Study of Extinction and Ignition of Methyl Decanoate in Laminar Nonpremixed Flows AbstractMethyl decanoate is a large methyl ester that can be used as a surrogate for biodiesel. In this experimental and computational study, the combustion of methyl decanoate is investigated in nonpremixed, nonuniform flows. Experiments are performed employing the counterflow configuration with a fuel stream made up of vaporized methyl decanoate and nitrogen, and an oxidizer stream of air. The mass fraction of fuel in the fuel stream is measured as a function of the strain rate at extinction, and critical conditions of ignition are measured in terms of the temperature of the oxidizer stream as a function of the strain rate. It is not possible to use a fully detailed mechanism for methyl decanoate to simulate the counterflow flames because the number of species and reactions is too large to employ with current flame codes and computer resources. Therefore a skeletal mechanism was deduced from a detailed mechanism of 8555 elementary reactions and 3036 species using "directed relation graph" method. This skeletal mechanism has only 713 elementary reactions and 125 species. Critical conditions of ignition were calculated using this skeletal mechanism and are found to agree well with experimental data. The predicted strain rate at extinction is found to be lower than the measurements. In general, the methyl decanoate mechanism provides a realistic kinetic tool for simulation of biodiesel fuels.

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Laminar flow between parallel plates with injection of a reactant at high reynolds number

Cited by 376 publications

References 9 publications

Opposed flow diffusion flame extensions

Opposed flow diffusion flame extensions

Propagation and extinction of premixed edge-flames

Experimental and kinetic modeling study of extinction and ignition of methyl decanoate in laminar non-premixed flows

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