Influence of Local Heating on Marangoni Flows and Evaporation Kinetics of Pure Water Drops

Langmuir : the ACS Journal of Surfaces and Colloids
Alexandros AskounisKhellil Sefiane

Abstract

The effect of localized heating on the evaporation of pure sessile water drops was probed experimentally by a combination of infrared thermography and optical imaging. In particular, we studied the effect of three different heating powers and two different locations, directly below the center and edge of the drop. In all cases, four distinct stages were identified according to the emerging thermal patterns. In particular, depending on heating location, recirculating vortices emerge that either remain pinned or move azimuthally within the drop. Eventually, these vortices oscillate in different modes depending on heating location. Infrared data allowed extraction of temperature distribution on each drop surface. In turn, the flow velocity in each case was calculated and was found to be higher for edge heating, due to the one-directional nature of the heating. Additionally, calculation of the dimensionless Marangoni and Rayleigh numbers yielded the prevalence of Marangoni convection. Heating the water drops also affected the evaporation kinetics by promoting the "stick-slip" regime. Moreover, both the total number of depinning events and the pinning strength were found to be highly dependent on heating location. Lastly, we report ...Continue Reading

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Citations

Oct 4, 2020·Advances in Colloid and Interface Science·K S Kolegov, L Yu Barash
May 7, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Pratibha GoelHuiling Duan
Jan 18, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Dimitrios MamalisKhellil Sefiane
Jul 24, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Rafal SlizTapio Fabritius
Aug 28, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Wei LiDongliang Li
Oct 30, 2020·ACS Nano·Yue ShiTakayoshi Sasaki
Nov 19, 2021·Physical Chemistry Chemical Physics : PCCP·Dongliang LiQiang Liao

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