Ring droplet formation during evaporation of a sessile water droplet on a biphilic surface

Numerous studies have investigated droplet evaporation on surfaces with different roughness and wet-tability values. However, most studies have focused on droplet evaporation from homogeneous surfaces at low surface temperatures (below 100 degrees C). In this study, we conducted droplet evaporation experi-ments on biphilic surfaces with different ring pattern sizes fabricated by a hybrid method consisting of the sol-gel approach and a picosecond laser system. This study investigated the droplet evaporation boil-ing phenomenon on these biphilic surfaces under superheated conditions. Changes in droplet geometry and inner bubble dynamics during evaporation were analyzed using a high-speed camera. A ring-shaped droplet formed during the final evaporation period. The formation of the ring enhanced the droplet evap-oration efficiency. Furthermore, the experimental results from this study work were compared with the theoretical model proposed in the literature. (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This study investigated droplet evaporation on biphilic surfaces and found that the formation of a ring-shaped droplet during the evaporation process enhanced the efficiency of evaporation. The experimental results were compared with the theoretical model proposed in the literature.