Puffing/micro-explosion in composite fuel/water droplets heated in flames

Dmitrii Antonov, Roman Fedorenko, Pavel Stryzhak, Zuhaib Nissar, Sergei Sazhin

Research output: Contribution to journalArticlepeer-review

Abstract

The results of new experimental and theoretical investigations of puffing and
micro-explosion of rapeseed oil/water droplets placed in ethanol and propane/butane mixture flames are presented. It is pointed out that time to puffing/microexplosion increases with increasing initial droplet radii in both flames. This time is always shorter for a propane/butane mixture flame (with maximal temperature 1,450 K) than for an ethanol flame (with maximal temperature 1,120 K). The experimental results are interpreted in terms of a simplified model of the phenomenon, in which it is assumed that a spherical water subdroplet is placed exactly in the centre of a spherical fuel droplet. The start of puffing/micro-explosion is linked with the time instant when the temperature at the water/rapeseed oil interface reaches the water nucleation temperature. The contributions of thermal radiation and supporting wire are taken into account for the first time for the analysis of the phenomena. It is shown that the model predictions agree with experimental data.
Original languageEnglish
Number of pages33
JournalCombustion and Flame
Publication statusPublished - 29 Jun 2021

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