Multi-Component dro‎plet Vaporization at near critical point

1/1/1900 12:00:00 AM

In this thesis, evaporation of multicomponent droplets near critical point is modeled numerically. In the present model, a fully transient formulation for the droplet vaporization at near fuel critical point is proposed. The vapor–liquid equilibrium has been described by Peng–Robinson equation of state. Gas-phase non-idealities, solubility of ambient gas in liquid-phase, and pressure and temperature based variable transport properties in both liquid- and vapor-phases are considered in the numerical model. The equations have been solved numerically by finite volume method. First, the modeling results have been validated for single- and two-components fuels with different volatility, in wide range of temperature and pressure. It was observed that the results of the present model are in good agreement with the experimental data available in the literature. The effect of ambient gas diffusion in single-component fuel was investigated, and then the evaporation process of the two-components droplet was described, and to study the effect of pressure at different temperatures, the effect of pressure changes on the two-components droplet of heptane-hexadecane was investigated. It was also observed that with the increase in pressure, the penetration of ambient gases in the liquid phase increases and the life of the droplet is less compared to the case where gas penetration is not considered.

تبخير قطره , نفوذ گاز , فشار بالا

dro‎plet evaporation , Gas solubility , high pressure

Mohammad Reza Goodarzi

Hojat Ghassemi