Puffing/micro-explosion of two closely spaced composite droplets in tandem: experimental results and modelling

Dmitry Antonov, Roman Fedorenko, Pavel Strizhak, Gullaume Castanet, Sergei Sazhin

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The results of the experimental and theoretical investigations of the mutual effect on their puffing/micro-explosion of droplets in a flow, using an example of two closely spaced droplets in tandem, are presented. It is shown that the time to puffing/micro-explosion (τ p) of the lead droplet is always shorter than that of the downstream droplet, and the difference between them decreases with increasing distance between droplets divided by their initial diameters (2R d0). It is shown that the τ p of both droplets increases with increasing R d0. The experimental results are interpreted in terms of the previously developed model for fuel/water droplet puffing/micro-explosion, based on the assumptions that the water sub-droplet is located in the centre of the fuel droplet and that this process is triggered when the temperature at the water/fuel interface reaches the water nucleation temperature. The effect of interaction between the lead and downstream droplets is taken into account via modifications to the Nusselt and Sherwood numbers for these droplets using the results of numerical calculations. Both experimentally observed and predicted values of τ p are shown to increase with increasing R d0. They are shown to be longer for the downstream droplets than for the lead droplets. The experimentally observed differences in τ p for the lead and downstream droplets are close to the predicted differences.

Original languageEnglish
Article number121449
Pages (from-to)1-17
Number of pages17
JournalInternational Journal of Heat and Mass Transfer
Publication statusPublished - 3 Jun 2021

Bibliographical note

Funding Information: (contribution by P.A. Strizhak), Scholarships from the President of the Russian Federation (Grants SP-447.2021.1 and MN-7/2260 ) (contributions by D.V. Antonov and R. Fedorenko), the EPSRC , UK (Grant No. EP/M002608/1 ) and the Royal Society (UK) (Grant No. IEC 192007 ) (contribution by S.S. Sazhin). Funding Information: Work on this paper was supported by the National Re-search Tomsk Polytechnic University (project VIU-ISHFVP-60/2019 )


  • Composite droplets
  • Droplets in tandem
  • Evaporation
  • Heating
  • Micro-explosion
  • Puffing


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