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- W4289762208 abstract "The present article reports the hitherto unreported phenomenon of arrested evaporation dynamics in pendent droplets in an electric field ambience. The evaporation kinetics of pendant droplets of electrically conducting saline solutions in the presence of a transverse, alternating electric field is investigated experimentally. It has been observed that while increase of field strength arrests the evaporation, increment in field frequency has the opposite effect. The same has been explained on the solvation kinetics of the ions in the polar water. Theoretical analysis reveals that change in surface tension and diffusion driven evaporation model cannot predict the arrested or decelerated evaporation. With the aid of Particle Image Velocimetry, suppression of internal circulation velocity within the droplet is observed under electric field stimulus, and this affects the evaporation rate directly. A mathematical scaling model is proposed to quantify the effects of electrohydrodynamic circulation, electrothermal and electro-solutal advection on the evaporation kinetics of the droplet. The analysis encompasses major governing parameters, viz. the thermal and solutal Marangoni numbers, the Electrohydrodynamic number, the electro Prandtl and electro Schmidt numbers and their respective contributions. It has been shown that the electrothermal Marangoni effect is supressed by the electric field, leading to deteriorated evaporation rates. Additionally, the electrosolutal Marangoni effect further supresses the internal advection, which again arrests the evaporation rate by a larger proportion. Stability analysis reveals that the electric body force retards the stable internal circulation within such droplets and arrests advection." @default.
- W4289762208 created "2022-08-04" @default.
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- W4289762208 date "2018-07-07" @default.
- W4289762208 modified "2023-09-27" @default.
- W4289762208 title "Competitive electrohydrodynamic and electrosolutal advection arrests evaporation kinetics of droplets" @default.
- W4289762208 doi "https://doi.org/10.48550/arxiv.1807.02720" @default.
- W4289762208 hasPublicationYear "2018" @default.
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