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Numerical and experimental investigation on evaporation of water droplet on surfaces with mixed wettability

Aboubakri, Akam and Yanık, Cenk and Akkuş, Yiğit and Koşar, Ali and Sadaghiani, Abdolali Khalili (2020) Numerical and experimental investigation on evaporation of water droplet on surfaces with mixed wettability. In: ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2020, collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 Fluids Engineering Division Summer Meeting, Virtual, Online

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Official URL: http://dx.doi.org/10.1115/ICNMM2020-1055

Abstract

Droplet evaporation is one of the most commonly observed phenomena and plays an important role in many applications such as in spray cooling, coating, and inkjet printing. Mechanisms such as dynamics of the contact line, evaporationinduced phase transitions, and formation of patterns on the substrate interact with each other in the evaporation of droplets. In this study, we investigated the effect of surface mixed wettability on water sessile droplet evaporation. The transient contact angle, center-height, contact radius, surface area, and droplet volume were experimentally measured and numerically estimated. Surfaces with mixed wettability consisting of hydrophilic islands surrounded by less hydrophilic area were fabricated. Visualization was conducted to capture droplet dynamics during evaporation using two high-speed cameras. According to the obtained results, there were three distinct stages in the water evaporation process: a constant contact radius mode, a constant contact angle mode, and a mixed-mode. The COMSOL 5.4 software was used for numerical analysis. According to the results, the receding contact angle and Marangoni instability in the droplet are two main factors that alter droplet dynamics and droplet evaporation.

Item Type:Papers in Conference Proceedings
Subjects:UNSPECIFIED
ID Code:41287
Deposited By:Ali Koşar
Deposited On:23 Dec 2020 15:46
Last Modified:23 Dec 2020 15:46

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