Droplet (Jul 2023)

Droplet orthogonal impact on nonuniform wettability surfaces

  • Shashwata Moitra,
  • Mohamed Elsharkawy,
  • Antonio Russo,
  • Sreya Sarkar,
  • Ranjan Ganguly,
  • Pietro Asinari,
  • Constantine M. Megaridis

DOI
https://doi.org/10.1002/dro2.63
Journal volume & issue
Vol. 2, no. 3
pp. n/a – n/a

Abstract

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Abstract The vast majority of prior studies on droplet impact have focused on collisions of liquid droplets with spatially homogeneous (i.e., uniform‐wettability) surfaces. But in recent years, there has been growing interest on droplet impact on nonuniform wettability surfaces, which are more relevant in practice. This paper presents first an experimental study of axisymmetric droplet impact on wettability‐patterned surfaces. The experiments feature millimeter‐sized water droplets impacting centrally with Weθ2 (i.e., the outer domain is more wettable than the inner one). The experimental observations are consistent with the scaling and predictions of the analytical model, thus outlining a strategy for predicting droplet impact behavior for more complex wettability patterns.