Ansys Forte uses a discrete multi-component (DMC) fuel-vaporization model [74] model to represent the vaporization of spray droplets. The DMC vaporization model tracks the individual components (molecules) of an actual surrogate fuel during the evaporation process and allows coupling with the reaction kinetics of the individual fuel components. In the DMC model, an explicit form of the equation that determines the heat flux from the surrounding gas mixture to the droplet-gas interface is obtained from an approximate solution of the quasi-steady energy equation. The model is formulated to track each component of the fuel regardless of the direction of the process, that is, whether evaporation from the droplet surface or condensation into the droplet is occurring.

The DMC vaporization model considers a spherical liquid droplet that consists of a finite number of components vaporizing without chemical reactions in a gaseous environment. Radiation and second-order effects such as the Soret and Dufour effects are assumed to be negligible.