Non-isothermal spreading dynamics of self-rewetting droplets

Mamalis, D and Sefiane, K and Sahu, Kirti Chandra and Karapetsas, G and Matar, O K (2015) Non-isothermal spreading dynamics of self-rewetting droplets. In: 68th Annual Meeting of the APS Division of Fluid Dynamics, 22–24 November, 2015, Boston, Massachusetts.

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We study the spreading dynamics of droplets on uniformly heated substrates. More specifically, we consider the case of binary alcohol mixtures which exhibit a non-monotonic dependence of the surface tension on temperature; these systems are often referred in the literature as self-rewetting fluids. We show through experiments that the early-stage spreading exponents depend non-monotonically on the substrate temperature in contrast to the monotonic dependence of pure liquids. In addition, we observe through the use of IR thermography visualization the formation of spontaneous travelling waves which develop along and across the free surface of the evaporating droplet and influence the spreading behaviour. Finally, we develop a theoretical model based on lubrication theory and derive an evolution equation for the interface accounting for capillarity and thermocapillarity. Using this model we investigate the effect of varying droplet wettability, which is linked to the temperature of the solid surface, on the spreading dynamics.

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IITH Creators:
IITH CreatorsORCiD
Sahu, Kirti Chandra
Item Type: Conference or Workshop Item (Paper)
Subjects: Chemical Engineering > Biochemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: Team Library
Date Deposited: 29 Sep 2015 07:38
Last Modified: 15 May 2018 08:58
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