Abstract
Solutions are presented of steady flowfields around buring fuel droplets at constant Reynolds number with finite-rate global kinetics. A finite-difference solution to the full set of conservation equations in two space dimensions provides droplet vaporization rates, drag coefficients, Nusselt numbers and flame structures over a range of Reynolds and Damkohler numbers. The study has been restricted to gas-phase combustion processes, therefore droplet internal circulation has been ignored and the droplet is assumed to be at a constant temperature near the boiling point. The results are interpreted in terms of the characteristic time scales for convection, diffusion and chemical reactions, and clearly demonstrate the effects of these scales on the presence of an envelope or wake flame. Comparisons are made with experimental measurements in the literature of envelope and wake flames on porous spheres for typical hydrocarbon fuels. Good qualitative agreement is obtained between numerical and experimental results for the two distinct flame structures.
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