“Soft” and “Hard” merging of head-on colliding droplets

Zhenyu Zhang, Chengming He, Peng Zhang

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review


Numerical simulation of sprays and spray combustion requires quantitatively predictive subgrid models for droplet collision and its outcomes. The dynamics of head-on merging between two equal-size droplets was numerically investigated, with emphasis on studying the collision dynamics before the occurrence of droplet merging. Front tracking method was adopted to simulate the “soft” and “hard” merging dynamics of previous experiment with transition collision Weber number, while Volume of Fluid simulation was also employed for comparison. Numerical results were sufficiently validated against the experimental shadowgraphs. Four distinct stages of vortex evolution were observed and explained according to the numerical results. Viscous dissipation was found to substantially influence the vortex dynamics, increasing of Oh promotes viscous dissipation hence results in the decreasing of the vorticity.

Original languageEnglish
Publication statusPublished - 1 Jan 2019
Event12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan
Duration: 1 Jul 20195 Jul 2019


Conference12th Asia-Pacific Conference on Combustion, ASPACC 2019

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Condensed Matter Physics


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