Stagnation Point Heat Transfer from Turbulent Methane-Air Flames

Fairweather, M.; Kilham, J.K.; Mohebi-Ashtiani, A.

doi:10.1080/00102208308923714

Cited by 25 publications

(7 citation statements)

References 13 publications

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“…The major disadvantage of this heating technique is the nonuniformity in heating on the target surface. This problem can 16 be addressed to some extent by using arrays of burners or by using the burner geometry that will give more uniform heat distribution at the surface. In flame impingement heat transfer studies different investigators have used different types of burner geometries.…”

Section: Introductionmentioning

confidence: 99%

Influence of Burner Geometry on Heat Transfer Characteristics of Methane/Air Flame Impinging on Flat Surface

Chander

Ray

2006

Experimental Heat Transfer

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An experimental study has been conducted to find the heat transfer characteristics of methane/air flames impinging normally to a flat surface using different burner geometries. The burners used were of nozzle, tube, and orifice type each with a diameter of 10 mm. Due to different exit velocity profiles, the flame structures were different in each case. Because of nearly flat velocity profile, the flame spread was more in case of orifice and nozzle burners as compared to tube burner. Effects of varying the value of Reynolds number (600-2500), equivalence ratio (0.8-1.5) and dimensionless separation distance (0.7-8) on heat transfer characteristics on the flat plate have been investigated for the tube burner. Different flame shapes were observed for different impingement conditions. It has been observed that the heat transfer characteristics were intimately related to flame shapes. Heat transfer characteristics were discussed for the cases when the flame inner reaction cone was far away, just touched, and was intercepted by the plate. Negative heat fluxes at the stagnation point were observed when the inner reaction cone was intercepted by the plate due to impingement of cool un-burnt mixture directly on the surface. Different heat transfer characteristics were observed for different burner geometries with similar operating conditions. In case of tube burner, the maximum heat flux is around the stagnation point and decay is faster in the radial direction. In case of nozzle and orifice burner, the heat transfer distribution is more uniform over the surface.

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Section: Introductionmentioning

confidence: 99%

Influence of Burner Geometry on Heat Transfer Characteristics of Methane/Air Flame Impinging on Flat Surface

Chander

Ray

2006

Experimental Heat Transfer

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“…9. It was found that the heat transfer rate was enhanced with increasing Reynolds number due to the increased convective heat transfer, as in the case for the single impinging flame jet [31][32][33][34][35]. Koopman [21] investigated the effect of Re on a pair of cold air jets and found that the heat transfer coefficients at the midway position were enhanced by a higher jet Reynolds number, which contributed to the enhancement of heat flux at the midpoint.…”

Section: Heat Transfer Characteristicsmentioning

confidence: 95%

“…Most previous investigations on impinging flame jets concentrated on a single jet [31][32][33][34][35][36][37][38]. The available information on multiple impinging flame jets was related to the study of radial jet reattachment flames and the multi-jets used in the rapid heating furnace.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and wall pressure characteristics of a twin premixed butane/air flame jets

Dong

Leung

Cheung

2004

International Journal of Heat and Mass Transfer

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“…The rapid mixing found in turbulent flows increases the heat and mass diffusion and the resulting rate of combustion and wall heat flux. In order to understand and characterize the influence of turbulence on heat flux and the flame structure, a number of studies have been conducted (see, for example, [5][6][7][8][9][10][11][12]). Temperature and velocity oscillations in flames have also been explored experimentally.…”

Section: Introductionmentioning

confidence: 99%

Convective heat transfer from a partially premixed impinging flame jet. Part II: Time-resolved results

Tuttle

Webb

McQuay

2005

International Journal of Heat and Mass Transfer

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This is the second of a two-part paper on heat transfer from an impinging flame jet reporting time-resolved results. Axial and radial profiles of time-resolved local heat fluxes of methane-air jet flames impinging normal to a cooled plate are reported, including the root mean square (RMS), probability distribution function (PDF), and the power spectral density (PSD) of the heat flux fluctuations as a function of equivalence ratio, Reynolds number, and nozzle-plate spacing. The RMS, PDF, and PSD of the heat flux signal from the stagnation point and along the plate revealed correlation of the local heat flux to the flame structure. Impingement heat flux from premixed nozzle-stabilized flames was characterized by small RMS fluctuations and frequency behavior indicating the formation of weak, buoyancy-driven vortex structures at the shear layer between the hot gases surrounding the flame and the ambient air. Conversely, diffusion flames were characterized by much larger RMS fluctuations and PSDÕs indicating the development of much larger vortex structures. Time-resolved heat flux for lifted flames varied according to flame structure and combustion intensity. PSD magnitudes were related to the range of temperatures in the flow; greater temperature ranges produced larger heat flux variations. The contributing frequencies were related to the duration of the heat flux fluctuation; more rapid changes in heat flux produced higher frequency content.

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Stagnation Point Heat Transfer from Turbulent Methane-Air Flames

Cited by 25 publications

References 13 publications

Influence of Burner Geometry on Heat Transfer Characteristics of Methane/Air Flame Impinging on Flat Surface

Influence of Burner Geometry on Heat Transfer Characteristics of Methane/Air Flame Impinging on Flat Surface

Heat transfer and wall pressure characteristics of a twin premixed butane/air flame jets

Convective heat transfer from a partially premixed impinging flame jet. Part II: Time-resolved results

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