Simulation of a single diesel-benzyl azide droplet vaporization characteristics in the absence of liquid phase reaction

To understand the effects of different physical properties on vaporization characteristics of diesel-benzyl azide blend droplet, the hexadecane was used as a representative for diesel and a multicomponent vaporization model for a single hexadecane-benzyl azide blend droplet in the absence of liquid phase reaction was built. The vaporization characteristics and the effects of ambient temperature and benzyl azide mass fraction were analyzed. Results show that the vaporization history of hexadecane-benzyl azide droplet can be divided into three phases: the transient heating phase, the mixing vaporization phase, and the equilibrium vaporization phase. Benzyl azide vaporizes much faster because of its larger saturated pressure, smaller specific heat capacity under the constant pressure, and larger vapor/nitrogen binary diffusivity. With increasing benzyl azide mass fraction, the vaporization rate is increased. And with increasing ambient temperature, the droplet temperature increasing rate, equilibrium vaporization temperature and vaporization rate are increased nonlinearly.