Ratio of water/fuel concentration in a group of composite droplets on high-temperature heating

Ratio of droplets with bubbles decreases significantly with increase in temperature. [Display omitted] •Puffing/micro-explosions have significant impact on the child droplet sizes.•Group effects on the ratio of water/Diesel fuel concentration were determined.•Child droplet sizes decrease by 24% with increase in temperature from 900 to 1000 °C.•Water volume decreases by 81.6% with increase in temperature from 800 to 1000 °C. The paper presents the experimental research findings on the water/Diesel fuel concentration ratio in a group of composite droplets after passing through a heated gaseous medium. The research was carried out using the optical methods of Planar Laser Induced Fluorescence and Shadow Photography. The experimental method involved measurements carried out while a group of composite droplets (water/Diesel fuel) was free-falling through a tubular muffle furnace. The findings have shown combined effects of droplets on the water and Diesel fuel concentration ratio at the furnace outlet. We have also shown how droplet collisions with each other and with a heated chamber wall affected the number and size of droplets of water and combustible liquid as they left the high-temperature zone. The limiting temperatures of the gaseous medium have been determined that are sufficient for the breakup of a group of composite droplets free-falling through a fixed-length operating section with heated gases. We have also calculated the required heating time and the length of the channel with a heated gas, so that parent composite drops break up into individual droplets of water and a combustible liquid. The numbers and sizes of fragments with different component compositions after passing through a heated gaseous medium have been determined as well. The relative proportion of composite droplets containing vapor bubbles at the furnace exit.