Evaporation of liquid fuel droplets is often studied inthe
Chapter 7, Problem 7.147(choose chapter or problem)
Evaporation of liquid fuel droplets is often studied inthe laboratory by using a porous sphere techniquein which the fuel is supplied at a rate just sufficient tomaintain a completely wetted surface on the sphere.Consider the use of kerosene at 300 K with a poroussphere of 1-mm diameter. At this temperature thekerosene has a saturated vapor density of 0.015 kg/m3and a latent heat of vaporization of 300 kJ/kg. Themass diffusivity for the vaporair mixture is 10?5m2/s.If dry, atmospheric air at V?15 m/s and T??300 Kflows over the sphere, what is the minimum mass rateat which kerosene must be supplied to maintain a wettedsurface? For this condition, by how much mustT?actually exceed Tsto maintain the wetted surfaceat 300 K?
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