Abstract
An experimental method is presented for the measurement of the evaporation rates of supermicronsized multicomponent oil droplets. The fundamental principle of the method rests upon balancing the time-dependent gravitational force on the droplet against an adjustable electrostatic force. Applying continuum diffusion theory to the evaporation process, the total droplet vapor pressure is evaluated both as a function of time and percentage mass evaporated. The evaporation rates of 100 pale oil droplets at 40°C and no. 2 diesel oil droplets at 25 and 40°C are measured. Results indicate vapor pressures measured for 100 pale oil compare favorably with those values extrapolated from distillation curves. In addition for the multicomponent liquids studied here, the vapor pressure is well modeled as an exponential function of percentage mass evaporated.
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