Numerical Investigation of Ethanol and Acetone spray injection into gaseous enviroment

Abstract

In this paper, the effect of evaporating sprays of Ethanol and Acetone injected into a cylindrical gaseous environment is numerically investigated. To make this investigation the Eulerian gas phase equations together with the Lagrangian liquid phase equations are solved assuming a two-way coupling between the two phases. According to the results, after a certain time from the start of injection, the overall percentage of total evaporation of acetone becomes significantly higher than ethanol, but at the early spraying time, both alcohols had similar overall evaporation rates. Also, in terms of spray tip penetration, they have almost the same amount of progress and more or less the same behaviour. Also due to the almost identical injection flow rate of the droplets, the effects on the velocity fields in the gas phase have been almost similar. The important point to compare is the gas phase temperature field for both sprays after 1.5 ms of injection. Due to the fact that most of the evaporation occurs when the particles reach boiling temperature and the fact that all the heat required for evaporation is taken from the gas phase, the ambient temperature becomes much lower in ethanol spray because ethanol’s boiling temperature and latent heat are both much higher than acetone.