Secondary atomization of a biodiesel micro-emulsion fuel droplet colliding with a heated wall

Alexander E. Ashikhmin, Nikita A. Khomutov, Maxim V. Piskunov, Vyacheslav A. Yanovsky

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1 Citation (Scopus)


Using high-speed video recording, we establish the following regimes of hydrodynamic interaction of a biodiesel micro-emulsion fuel droplet with a heated wall: deposition (including drop spreading and receding), drop hydrodynamic breakup, and rebound. Collision regime maps are plotted using a set of dimensionless criteria: Weber number We = 470-1260, Ohnesorge number Oh = 0.146-0.192, and Reynolds number Re = 25-198. The scenarios of droplet hydrodynamic disintegration are studied for transient and film boiling. We also estimate the disintegration characteristics of a biodiesel micro-emulsion droplet (mean diameter of child droplets, their number, and evaporation surface area increase due to breakup). The study establishes the effect of water proportion on the micro-emulsion composition (8-16 vol. %), heating temperature (300-500 °C), droplet size (1.8-2.8 mm), droplet velocity (3-4 m/s), rheological properties of the examined compositions, and emulsifier concentration (10.45 vol. % and 20 vol. %) on the recorded characteristics. The results show that the initial liquid surface area can be increased 2-19 times. The paper analyzes ways to control the process. The hydrodynamic disintegration characteristics of a biodiesel micro-emulsion fuel droplet are compared using 2D and 3D recording.

Original languageEnglish
Article number685
JournalApplied Sciences (Switzerland)
Issue number2
Publication statusPublished - 1 Jan 2020



  • Biodiesel
  • Child droplets
  • Heated wall
  • Impact outcome
  • Interaction
  • Micro-emulsion fuel

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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