Droplet evaporation under spray-like conditions

Evaporation of a droplet in a spray is affected by the neighboring droplets via their heat and mass diffusion. Aiming to investigate this effect, in this paper, the evaporation of a droplet is considered while it is assumed to be surrounded by the same evaporating droplets. A fully transient approach is applied to simulate the evaporation of a multicomponent droplet in a hypothetical spherical bubble. Three different fuels are employed; heptane, hexadecane, and a 50%-50% of their blend. The heat and mass influence extents of a droplet are introduced and their variations are investigated during the evaporation. To show the effects of neighbor droplets, the temperature and species concentration in both liquid and gas phases are compared to those of an isolated droplet. The effects of the droplet spacing, fuel types, and ambient temperature are studied. The result unveils that the effects of neighbor droplets become significant for spacing parameters less than 55 correspondings to the equivalence ratio around 10. Also, this effect becomes attenuate at higher ambient temperatures and lighter fuels. (C) 2019 Elsevier Ltd. All rights reserved.