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. A significant increase in the integral characteristics of evaporation by introducing opaque inclusions into droplets was observed. The influence of energy accumulation on the conditions of droplet evaporation at the internal solid/liquid interfaces was established. For proportioned inclusions, the conditions of intensive vaporization (leading to the explosive disintegration of droplets) at internal inclusion/liquid interfaces was set. To summarize research results, experiments were conducted with the combustion products of kerosene, gasoline, industrial alcohol, acetone, and oil. The particles of graphite, carbon, and aluminum as solid inclusions were used. The investigation compared integral characteristics of heterogeneous droplet evaporation under the conditions of non-stationary (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.