Proceedings PaperConvective evaporation of water aerosol droplet irradiated by CO2 laser
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Theoretical insight into aerosol particle heating/evaporation by laser radiation takes a great deal of activity. However, detailed investigations are mainly aimed at diffusion, diffusion/convection, and gas-kinetic evaporation. The convective subsonic (and sonic-speed) evaporation of a water droplet (at the condensation coefficient (alpha) equals1) under laser radiation is considered, with the Mach number at the Knudsen layer boundary being found by means of numerically solving the non-stationary hydrodynamics equations for an external flow pattern. However, the droplet surface temperature was determined on the basis of the assumption that temperature gradients within the droplet are insignificant; as for rapid heating and convective evaporation of a droplet of a few micrometers, this assumption is not valid. This paper focuses on the influence of the condensation coefficient on the sonic/subsonic convective evaporation of a water droplet subjected to continuous wave laser radiation (or to pulses such that the phenomenon can be considered quasistationary). For these quasistationary conditions, a simple relation is derived for determining the Knudsen layer boundary Mach number. Then the heat equation with variable coefficients is solved to evaluate radial distributions.