Evaporation and Ignition of a Fuel Droplet on a Hot Surface : Part 1, Evaporation

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This paper concerns the evaporation process of a single droplet of n-cetane and n-heptane on a hot surface. The initial diameter of the droplet is approximately 2 mm and the hot surface is made of stainless steel and the range of its surface temperatures is between 300℃ and 600℃ which involves the maximum evaporation rate point and the Leidenfrost point. From results of this experimental study, the effects on the evaporation life time of the gas temperature around the droplet and of the surface roughness are clarified. Furthermore, by the observation of the evaporation process through a high speed camera, the evaporation life time curve is divided into 6 regions according to the mode of evaporation of the droplet. Especially, the evaporation process in the transition region can be interpreted by the successive change of the modes of evaporation, that is from the contact evaporation to the spheroidal evaporation.
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