Published Paper Details:

The present work is a mathematical model for the droplet evaporation and ignition of a single droplet of a pure hydrocarbon fuel at high pressure. The finite difference method is used to solve transient equations of continuity, species and energy in the vapor phase and species and energy in liquid phase. The vapor-liquid equilibrium has been described by Peng-Robinson equation of state. In this model, the high pressure transient effects, variable thermo-physical properties and inert species solubility in the liquid-phase are considered. The evaporation model has been extensively validated with experimental results available in literature. The ignition model has been tested for ambient temperature of 1200 K. The ambient pressure varies in the rage from 10 bar to 80 bar. The ignition delay was found to be strong functions of temperature, pressure and diameter. The ignition time decreases monotonically with increase in ambient pressure and temperature. At each pressure there existed a minimum diameter below which ignition does not takes place and this minimum diameter decreases with increase in pressure.