Experimental and model studies of various size water droplet impacting on a hydrophobic surface

Abba Abdulhamid Abubakar, Bekir Sami Yilbas*, M. Hussain A-Qahtani, Ghassan Hassan, Mubarak Yakubu, Saeed Bahatab, John A.E. Adukwu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Impacting droplet on a hydrophobic surface is investigated and droplet size effect on impacting properties is examined. Liquid pressure variation inside droplet is numerically simulated in the impacting and rebounding periods. Droplet motion on impacted hydrophobic surface is monitored using a high-speed recording system. We showed that predictions and high-speed data for droplet shape and geometric features appear to be almost identical in the spreading and retraction of the droplet on sample surface. Increased volume of droplet gives rise to the peak pressure enhancement in droplet liquid during impact. The maximum droplet height remains larger for large volume droplets in both spreading and retraction cycles. Increasing size of droplet enlarges the wetting diameter on the impacted surface during droplet deformation on sample surfaces. The rate of peak velocity of the spreading surface of the droplet is faster for larger droplets as compared to that corresponding to small droplets. The ratio of spreading period over the retraction period of the droplet becomes small for droplets with small size.

Original languageEnglish
Article number061402
JournalJournal of Fluids Engineering, Transactions of the ASME
Issue number6
StatePublished - Jun 2021

Bibliographical note

Publisher Copyright:
Copyright © 2021 by ASME


  • Droplet impact
  • Hydrophobic surface
  • Retraction
  • Spreading

ASJC Scopus subject areas

  • Mechanical Engineering


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