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On evaporation rate and interfacial temperature of volatile sessile drops
journal contributionposted on 18.07.2017 by Victor Starov, Khellil Sefiane
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A theoretical description of the evaporation of sessile drops is proposed. The linear dependency of the evaporation rate on droplet’s base radius is described as well as the interfacial temperature. The analysis shows that most of evaporation is indeed concentrated near the contact line as demonstrated by experiments from literature. The evaporative cooling induced by evaporation results in a non-uniform temperature profile along the interface, being colder on the apex and hotter near the contact line. This result is counter-intuitive. It is the reason why the physical explanations are provided. Interfacial temperature gradient leads to Marangoni thermocpaillary driven flow within the drop.
V. Starov acknowledges a support by the Engineering and Physical Sciences Research Council, UK (Grant EP/D077869/1).
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