Gurrala, Pradeep and Katre, Pallavi and Balusamy, Saravanan and et al, .
(2019)
Effect of substrate temperature on evaporation of ethanol-water sessile droplet.
In: Proceedings of the 16th Asian Congress of Fluid Mechanics, 13-17 December 2019, Bengaluru, India.
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Abstract
The evaporation dynamics of an ethanol-water (E 50% + W 50%) binary sessile droplet of volume 5µl is studied experimentally and theoretically. The focus of this work is to investigate the effect of the substrate temperature (Ts) on the evaporation dynamics. A cellulose acetate tape with a surface roughness of 668 nm is used as the substrate. Two distinct evaporation stages are observed at Ts = 25 ⁰C, namely an early pinned stage and a later receding stage. The higher volatile ethanol evaporates faster leading to a nonlinear trend in the evaporation process at the early stage. In contrast, at Ts = 60 ⁰C, three distinct phases are observed, which are the early spreading stage, an intermediate pinned stage and a late receding stage of evaporation. We have developed a theoretical model that combines evaporative diffusion, natural convection and passive transport of vapour, which predicts the experimental behaviour well.
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