Abstract
Micro-explosions in composite droplets: experimental observations and modelling
Highlights
It is well known that micro-explosions in water/fuel composite droplets, leading to their rapid disintegration, can substantially improve internal combustion engine performance, as discussed in [1]
The difference in the time to puffing inferred from the assumptions that puffing starts at water boiling and nucleation temperatures needs to be taken into account, regardless of which model for puffing/micro-explosion is used in the analysis
Developed models for puffing/micro-explosion are based on the assumption that a small spherical water sub-droplet is located in the centre of a fuel droplet
Summary
It is well known that micro-explosions in water/fuel composite droplets, leading to their rapid disintegration, can substantially improve internal combustion engine performance, as discussed in [1]. The main problem with the application of these models to the analysis of the experimental data is that they require the identification of the exact initial location of water inside the fuel droplets It would be very difficult, sometimes impossible, to do this in the experiments described above. The model described in this paper is based on the assumption that the fuel shell is spherically symmetric It focuses on the heating of water and the fuel shell and is based on an application of the analytical solution to the heat transfer equation for the temperature inside a fuel/water droplet as a function of the distance from its centre and time. Based on the above-mentioned analytical solution, the time instant when the temperature at the water/fuel interface reaches the water boiling temperature was found This temperature indicates the start of the puffing process quickly leading to micro-explosion.
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