Investigation on the droplet evaporation process on local heated substrates with different wettability

Yan, Yuying; Wang, Xin; Liu, Zeyu; Wang, Li

Abstract

Marangoni effect is one of the critical factors in the droplet evaporation process, which is caused by surface tension gradient in the droplet interface. In this study, local heating is adopted to provide a more complicated temperature distribution on the droplet surface, and a detailed numerical investigation is carried out to address the effect of Marangoni flow on the droplet evaporation behaviour. Results show that asymmetric heat source position could result in the droplet morphology being asymmetric, especially for droplets on super-hydrophilic surfaces. The evaporation rate could be affected both by the heat source position and the droplet contact angle. When placed on a smooth substrate, the droplet will slip horizontally as a result of the asymmetric heating condition. The slipping behaviour is affected by both the heat source position and the surface wettability.

Citation

Yan, Y., Wang, X., Liu, Z., & Wang, L. (2020). Investigation on the droplet evaporation process on local heated substrates with different wettability. Heat and Mass Transfer, https://doi.org/10.1007/s00231-020-03005-6

• Journal Article Type: Article
• Acceptance Date: Nov 22, 2020
• Online Publication Date: Dec 9, 2020
• Publication Date: Dec 9, 2020
• Deposit Date: Apr 30, 2021
• Publicly Available Date: Apr 30, 2021
• Journal: Heat and Mass Transfer/Waerme- und Stoffuebertragung
• Print ISSN: 0947-7411
• Electronic ISSN: 1432-1181
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1007/s00231-020-03005-6
• Keywords: General Engineering; Condensed Matter Physics; Fluid Flow and Transfer Processes
• Public URL: https://nottingham-repository.worktribe.com/output/5141613
• Publisher URL: https://link.springer.com/article/10.1007/s00231-020-03005-6