THE EFFECTS OF SURFACTANTS ON DROPLET BEHAVIOR AT INTERMEDIATE REYNOLDS-NUMBERS .2. TRANSIENT DEFORMATION AND EVAPORATION

Early life histories of clean and contaminated n-heptane droplets inje cted into high-temperature air (1000 K, 10 aim) at a Reynolds number o f 100 are examined in an effort to determine the effects of surfactant s on droplet behaviour. Transient variations in droplet shape, mass, a nd velocity, and all effects due to liquid-phase motion and heating, a nd variable thermophysical properties are included in this numerical s tudy. A detailed analysis of droplet oscillation, surfactant transport , interfacial stresses, liquid-phase motion, droplet drag, and heat an d mass transfer is presented along with engineering correlations which may be useful in spray modelling.