An evaporation model for oscillating spheroidal drops

The evaporation process of a liquid spheroidal drop floating in a gaseous atmosphere has been modelled, accounting for the oscillation between oblate and prolate states. A previously developed exact solution for the heat and mass transfer equations has been extended to investigate the effect of oscillation on drop evaporation under the assumption of quasi steady-state conditions and the results are compared with approximate models from the open literature. The validity of the quasi steady-state assumption is discussed, deriving, for different fluids, the range of drop temperature and size and gas temperature where it is reasonably acceptable.