Abstract
The effect of the thermal properties of the system on the lifetime of an evaporating sessile droplet of water is analysed using a fully coupled model which involves determining the temperature of the droplet, the substrate and the atmosphere. The evolutions, and hence the lifetimes, of droplets of water evaporating in both of the extreme modes are calculated. In particular, it is shown how the lifetimes of droplets of water can be strongly influenced by thermal effects. Droplets with larger initial contact angles or on less conductive substrates generally have longer lifetimes than those with smaller initial contact angles or on more conductive substrates, and the physical mechanism by which the thermal properties of the system influence the evaporation can be understood in terms of the thermal anchoring between the droplet and the lower surface of the substrate.
| Original language | English |
|---|---|
| Article number | 141 |
| Journal | Fluids |
| Volume | 6 |
| Issue number | 4 |
| Early online date | 3 Apr 2021 |
| DOIs | |
| Publication status | Published - 3 Apr 2021 |
Data Availability Statement
All of the numerical results presented in the present work can be reproduced by solving the system of equations and boundary conditions described in Section 2.Acknowledgements
The authors are grateful to Brian R. Duffy and Alexander W. Wray (both University of Strathclyde) for insightful discussions about various aspects of droplet evaporation.Funding
This research was funded via a Research Studentship for F.G.H.S. by the UK Engineering and Physical Sciences Research Council (EPSRC) through EPSRC Doctoral Training Partnership Grant EP/N509760/1, the University of Strathclyde, and the University of Edinburgh.