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Postcontact droplet spreading and bubble entrapment on a smooth surface

Lige Zhang, Tejaswi Soori, Arif Rokoni, and Ying Sun*

  • Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, Pennsylvania 19104, USA

  • *ys347@drexel.edu
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Phys. Rev. Fluids 7, 104003 – Published 18 October, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.104003

Abstract

In this paper, we use a combination of high-speed imaging and total internal reflection microscopy to study postcontact spreading dynamics and bubble entrapment of droplets impacting on surfaces lubricated with an immiscible fluid, following dimple and film modes of contact. The postcontact droplet spreading entraps two types of bubbles: (i) surface and (ii) bulk, where the former occurs when the bubbles remain at the droplet-surface interface and the latter takes place within the droplet because of the impact-induced air-cavity closure. The dimple mode of droplet-surface contact shows an absence of central surface bubble due to the contact point at the drop center and the subsequent axisymmetric spreading. The surface radial bubbles can be suppressed by tuning the impact velocity, liquid surface tension, and viscosity. Early-stage postcontact spreading dynamics are then studied for the dimple mode, where a viscocapillary scaling for the spreading radius rwet versus time t of rwet∼t is observed. Finally, the critical capillary number for wetting failure scaling is used to predict the presence of surface radial bubble entrapment with good accuracy.

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Phys. Rev. Fluids 7, 104003– Published 18 October, 2022
  • Received 30 July 2022
  • Accepted 30 September 2022
Article part of CHORUS
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