Consider a laminar methane diffusion flame stabilized on a circular burner. The pressure is 1 atm and the ambient temperature is 25C. (a) For a fixed fuel mass flow rate, how does the flame height vary with ambient pressure? Hint: the diffusivity is inversely proportional to pressure. (b) If the height of the diffusion flame is Lf, qualitatively sketch the axial (centerline) profiles of the following quantities from the base of the diffusion flame to a height of 2Lf: temperature, methane, and carbon dioxide concentrations.
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