Dataset

High frame-rate imaging Physics of Fluids (2023) paper

The post-impact dynamics and spreading rates of picolitre liquid droplets on surfaces are critical to many practical and industrial applications, as well as respiratory disease transmission mechanisms. Here we use a high framerate imaging method to explore the shape oscillations and spreading of individual ~10-180 pL volume droplets (corresponding to ~30-70 µm in initial droplet diameter) impacting on a surface under ambient conditions with 10 µs temporal resolution. The method allows the surface tension to be accurately extracted from the measured frequency of post-impact shape oscillations for sessile droplets in this size range with surface tensions greater than 40 mN m-1 and viscosities up to at least 3.2 mPa s. The Tanner’s law model for predicting sessile droplet spreading rates provides an accurate account of the ‘steady-state’ spreading rate for all droplets with surface tensions in the range 22–73 mN m-1 studied here. However, Tanner’s law does not account for the delay in the onset of spreading observed for droplets in this size range, caused by competition between shape oscillations and spreading governing the morphology at short time periods, particularly for surface tensions >22 mN m-1.

Complete download (zip, 205.8 KiB)

Creator(s)	Jonathan Reid, Jim Walker, Lauren McCarthy
Publication date	01 Dec 2023
Language	eng
Publisher	University of Bristol
Licence	Non-Commercial Government Licence for public sector information
DOI	10.5523/bris.882ciio84luc2k99urkp5s2yb
Citation	Jonathan Reid, Jim Walker, Lauren McCarthy (2023): High frame-rate imaging Physics of Fluids (2023) paper. https://doi.org/10.5523/bris.882ciio84luc2k99urkp5s2yb
Total size	205.8 KiB

High frame-rate imaging Physics of Fluids (2023) paper

Data Resources