International Scientific Journal

Thermal Science - Online First

online first only

The features of heterogeneous water droplet evaporation in high-temperature combustion products of typical flammable liquids

This paper presents the experimental results on heating and evaporation features of heterogeneous (with opaque solid particles - the size of 0.05-0.5 mm, relative mass concentration 0-1 %) water droplets (the initial size - radius 1-3 mm) during their motion through high-temperature (500-1800 K) gases. We observed a significant increase in the integral characteristics of evaporation by introducing opaque inclusions into droplets. We established the influence of energy accumulation on the conditions of droplet evaporation at the internal solid / liquid interfaces. For proportioned inclusions, we set the conditions of intensive vaporization (leading to the explosive disintegration of droplets) at internal inclusion / liquid interfaces. To summarize research results, experiments were conducted with the combustion products of kerosene, gasoline, industrial alcohol, acetone, and oil. We used the particles of graphite, carbon, and aluminum as solid inclusions. Also, we compared the integral characteristics of heterogeneous droplet evaporation under the conditions of nonstationary (gas temperature varied from 1800 K to 500 K over the length of channel) and nearly stationary (gas temperature was maintained at about 1100 K) heating.
PAPER REVISED: 2015-01-12
PAPER ACCEPTED: 2016-01-20
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