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A numerical study of steady diffusion flames established over ethanol fed porous spheres

Vaibhav Kumar Sahu Vaibhav Kumar, Vasudevan Raghavan Vasudevan

Archivum Combustionis

2011

Vol. 31 nr 4

211-222

An investigation of steady burning of liquid ethanol at the surface of porous spheres subjected to forced convective air flow has been carried out in this study. In this study, the diameter of the porous sphere is kept constant at 10 mm. Gasphase combustion at atmospheric pressure and under normal gravity has been studied numerically. A numerical model, which employs variable thermo-physical properties, a global single-step reaction mechanism and an optically thin radiation model, has been first validated against the published experimental results obtained from porous sphere technique. The validated model has been employed to study the effect of air velocity on flame behavior. Numerical results in terms of burning rates and velocity profiles around the sphere are presented. The flame zone in the front portion of the sphere (front stagnation point), where fresh air is supplied, becomes unstable as the air velocity is increased. This has been analyzed using the quantities such as oxygen contours and the momentum ratio.