Droplet Size Effect in Non-Equilibrium Evaporation

Details Droplet Size Effect in Non-Equilibrium Evaporation Droplet Size Effect in Non-Equilibrium Evaporation

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.539s&link_type=abstract

IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,

Computer Science

Scientific paper

modeling of evaporation, which is extremely important for small droplets and sprays. Combustion of hydrocarbon fuels takes place mostly in a gas-phase regime. Thus, evaporation of fuel from the surface of droplets turns to be one of the limiting factors of the process. effects mask the influence of non-equilibrium processes in phase transitions making the proper understanding of the phenomenon very difficult in the ground-based experiments. Besides, non-equilibrium effects have a stronger manifestation for the droplets of small radii. To determine the rates of droplet evaporation and combustion in microgravity experiments one needs for experimental data processing an adequate theoretical model accounting for non-equilibrium effects. usually based on the assumptions of the equilibrium character of phase transitions. Comparison of theoretical and experimental data shows, that this assumption being undoubtedly valid for large droplets and flat surfaces, brings to essential errors for small droplets. parameter I characterizing the deviation of phase transition from the equilibrium was introduced, that made it possible to investigate its influence on variations of the Peclet number. that the rate of evaporation strongly depends on the value of the parameter. On increasing I Peclet number decreases rapidly as compared with the equilibrium evaporation; the deviations of the evaporation rates from those predicted by the equilibrium model turn to be larger and larger. Thus in order to have adequate estimates for small droplets evaporation rate one needs to use the non-equilibrium model for I>1. quasi-equilibrium solution loses validity on decreasing the droplet radius, because the evaporation rate and vapor velocity both tend to infinity. The non-equilibrium solution, at the same time, gives final values for flow velocities, that turn to be subsonic as long as the ratio of molar masses of the evaporating component and ambient gaseous mixture remains less than 10. pulverized fuels combustion, and could be easily incorporated into the numerical models. INTAS (Grant 01-0706).

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