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Evaporation of Ethanol-water Droplet at Different Substrate Temperatures and Compositions by Gurrala, Pradeep; Katre, Pallavi; Balusamy, Saravanan; Banerjee, Sayak; Sahu, Kirti Chandra is a scholarly article available to read on EtoBox.

What is Evaporation of Ethanol-water Droplet at Different Substrate Temperatures and Compositions about?

We experimentally investigate the evaporation dynamics of sessile droplets of a fixed volume consisting of different compositions of ethanol-water binary mixture at different substrate temperatures (T_s). At T_s=25oC, we observe pinned-stage linear evaporation for pure droplets, but a binary droplet undergoes two distinct evaporation stages: an early pinned stage and a later receding stage. In the binary droplet, the more volatile ethanol, evaporates faster leading to a nonlinear trend in the evaporation process at the early stage. The phenomenon observed in the present study at T_s=25oC is similar to that presented by previous researchers at room temperature. More interesting dynamics is observed in the evaporation process of a binary droplet at an elevated substrate temperature. We found that the lifetime of the droplet exhibits a non-monotonic trend with the increase in ethanol concentration in the binary mixture, which {can be attributed to} the non-ideal behaviour of water-ethanol binary mixtures. Increasing T_s decreases the lifetime of the (50\% ethanol + 50 \% water) binary droplet in a logarithmic scale. For this composition, at T_s=60oC, we observed an early spreading sta

Author

Gurrala, Pradeep; Katre, Pallavi; Balusamy, Saravanan; Banerjee, Sayak; Sahu, Kirti Chandra

Published

2019

Language

EN