Ignition and extinction of flames near surfaces: Combustion of CH<sub>4</sub> in air

Vlachos, Dionisios G.; Schmidt, L.D.; Aris, Rutherford

doi:10.1002/aic.690400611

Cited by 72 publications

(18 citation statements)

References 34 publications

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“…His work was followed by many other groups, whose work confirmed that depending on geometry, composition, and flow rate, hydrocarbon/air flames are typically quenched when confined within spaces with critical dimensions < 1-2 mm [5][6][7][8][9]. The two primary mechanisms for quenching in these systems are thermal and radical quenching [2,10,11]. Increased heat-transfer coefficients are inherent to microscales, because for a fixed Nusselt number, the heat-transfer coefficient scales with the inverse of the length scale.…”

Section: Introductionmentioning

confidence: 91%

A CFD study of propane/air microflame stability

Norton

Vlachos

2004

Combustion and Flame

269

146

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Section: Introductionmentioning

confidence: 91%

A CFD study of propane/air microflame stability

Norton

Vlachos

2004

Combustion and Flame

269

146

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“…Second, the lower temperature leads to smaller mole fractions of radicals at the surface. Here, the radicals are far less concentrated at the surface than in Vlachos et al 28 or Aghalayam et al 29 .…”

Section: Effect Of Surface Radical Interactionsmentioning

confidence: 61%

A computational study of solid trioxane combustion in stagnation-point flows

Rhatigan

Sung

T’ien

2001

39th Aerospace Sciences Meeting and Exhibit

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A solid fuel burning in a stagnation-point configuration is examined computationally over the full range of flammable stretch rates, from the blow-off extinction limit to the low-stretch extinction limit. Detailed kinetics, solid surface radiation interaction, and narrowband gas-phase radiation are included in the computational model of burning trioxane (C 3 H 6 O 3 ). The detailed kinetics model includes the decomposition of trioxane to formaldehyde and the subsequent combustion of formaldehyde. The solid surface radiation model addresses emission and absorption by the surface. The narrow-band radiation model includes the participating gases CO 2 , H 2 O, and CO. Scattering is not included due to the smokeless flame produced by trioxane. The adiabatic solutions are compared to solutions that include surface radiation only and the combination of surface radiation and gas-phase radiation. Flame structures are compared, with emphasis in the low stretch extinction regime where radiation effects are most apparent. Potential effects of radical recombination at the solid surface are examined. Application to fire safety in micro-gravity is also emphasized.

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“…The wall has a thickness of 0.2 mm and the combustor length is 12 mm. At the inlet plane, the mixture enters the combustor with a uniform temperature T u = 300 K. Vlachos et al [27] noted that for methane oxidation, the C1-path is the principal channel for fuel-lean flames, while the C2-path (conversion of CH 4 to higher hydrocarbons) which consists of about 200 elementary reactions becomes important for sufficiently fuel-rich mixtures. Therefore, the fuel-air equivalence ratio is chosen to be 0.9 to ensure that C1-path alone can give sufficient accuracy.…”

Section: Propertiesmentioning

confidence: 99%