Effects of surface roughness on droplet impact dynamics.

Joe Ghossein¹, Chinmay Kendurkar¹, Jonathan B Boreyko², Olivier Coutier-Delgosha^1,3

¹Kevin T. Crofton Department of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VA, USA. joe20ghossein@vt.edu.

²Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, USA.

³CNRS, ONERA, Arts et Métiers ParisTech, Centrale Lille, FRE 2017 - LMFL, Laboratoire de Mécanique des Fluides de Lille, F-59000 Lille, France.

PubMed DOI

Abstract

Past investigations into droplet impact dynamics have mostly used either relatively smooth substrates or air-trapping superhydrophobic textures. For this reason, existing models for predicting the maximum spreading ratio of impacting droplets (βmax = Dmax/D0) are unable to capture the influence of surface roughness. In this study, we investigate the influence of roughness and substrate wettability…

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