Expansion/micro-explosion of ethanol-biodiesel droplet doped with microparticles in oxygenated hot co-flow

Abstract

In this paper, under normal pressure and air atmosphere, the single droplet suspension method was used to study the expansion and evaporation characteristics of ethanol-biodiesel mixed droplets under different coal slime particle content and different particle size. In the experiment, a nickel wire was used as a suspension, a stepping motor was used for precise advancement, and the entire evaporation process of the droplet was completely recorded through color gradation processing and binary imaging technology. Experimental results show that the addition of micron-sized slime particles will increase the evaporation rate of droplets. The total evaporation rate (K) of the droplets increases as the content of slime particles increases, making the total evaporation time of the fuel droplets containing 3 % slime particles the shortest. The stable evaporation rate (K3) of the droplets first decreased and then increased, and the stable evaporation rate of the droplets containing 1 % of coal slime particles was the highest. Furthermore, at the same particle content, the evaporation rate of droplets containing 60 μm slime particles was the fastest.