Abstract
Some of the most recent experimental and modelling results concerning the puffing/micro-explosion of water-fuel composite droplets are presented and discussed. The experimental results refer to images of droplets during puffing/micro-explosion, times to puffing/micro-explosion and measurements of the temperatures inside the droplets. The model for puffing and micro-explosion assumes that a small spherical water sub-droplet is located in the centre of a fuel droplet. The heat conduction equation is solved analytically inside this droplet at each time step, using the Robin boundary condition at its surface and the continuity conditions at the fuel-water interface. This analytical solution and an appropriate approximation of the nucleation temperature are incorporated into a numerical code in which droplet evaporation and the variable thermophysical properties are accounted for. It is assumed that the puffing/micro-explosion process starts when the temperature between water and fuel reaches the nucleation temperature of water. The model predictions are shown to be consistent with available experimental data referring to the time to puffing/micro-explosion.
Original language | English |
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State | Published - 31 Aug 2021 |
Externally published | Yes |
Event | 15th Triennial International Conference on Liquid Atomization and Spray Systems, ICLASS 2021 - Edinburgh, United Kingdom Duration: 29 Aug 2021 → 2 Sep 2021 |
Conference
Conference | 15th Triennial International Conference on Liquid Atomization and Spray Systems, ICLASS 2021 |
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Country/Territory | United Kingdom |
City | Edinburgh |
Period | 29/08/21 → 2/09/21 |
Keywords
- Composite water/fuel droplets
- Robin boundary conditions
- droplet heating/evaporation
- micro-explosions
- nucleation temperature
ASJC Scopus subject areas
- Surfaces, Coatings and Films