Abstract
An experimental study has been conducted to investigate the effect of burner diameter on heat transfer characteristics of methane/air flames impinging normally to a flat surface. Three different tubes of internal diameter 8 mm, 9.7 mm and 12 mm were selected as flame holders. Effects of firing rates and equivalence ratios were studied on stagnation point and radial heat flux distribution. Three firing rates (0.25 kW, 0.40 kW and 0.50 kW) and three equivalence ratios (0.8, 1.0 and 1.2) were considered. Stagnation point heat flux was compared for different burner diameters under similar conditions. Radial heat flux distributions over the surface for different burner diameters under different firing rates and equivalence ratios were compared. It was found that the heat flux distribution was intimately related to flame shapes and sizes.
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