Micro-explosions in composite droplets: experimental observations and modelling

Sergei S. Sazhin, Tali Bar-Kohany, Zuhaib Nissar, Dmitrii Antonov, Pavel A. Strizhak, Oyuna D. Rybdylova

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

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 languageEnglish
StatePublished - 31 Aug 2021
Externally publishedYes
Event15th Triennial International Conference on Liquid Atomization and Spray Systems, ICLASS 2021 - Edinburgh, United Kingdom
Duration: 29 Aug 20212 Sep 2021

Conference

Conference15th Triennial International Conference on Liquid Atomization and Spray Systems, ICLASS 2021
Country/TerritoryUnited Kingdom
CityEdinburgh
Period29/08/212/09/21

Keywords

  • Composite water/fuel droplets
  • Robin boundary conditions
  • droplet heating/evaporation
  • micro-explosions
  • nucleation temperature

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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