Effect of surface wettability on evaporation rate of droplet array

Ur Rehman, Mohib, Askounis, Alex ORCID: https://orcid.org/0000-0003-0813-7856 and Nagayama, Gyoko (2023) Effect of surface wettability on evaporation rate of droplet array. Physics of Fluids, 35 (3). ISSN 1070-6631

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The evaporation of droplets in an array is hindered by adjacent droplets because of vapor-mediated interactions. Existing theoretical models for predicting the evaporation rate of droplets in the array neglect the important factor of surface wettability. In this work, we developed a model involving a contact angle function to accurately predict the evaporation rate of droplets with an arbitrary contact angle in the array. Fick's first and second laws were solved for evaporating droplets in the array by using steady-state three-dimensional numerical simulations, to derive the contact angle function. The proposed model was experimentally validated for arrayed droplets evaporating on flat hydrophilic and hydrophobic surfaces. We show that the contact angle function approaches unity on hydrophilic surfaces, which implies that the proposed model coincides with Wray et al.'s model. On the other hand, the contact angle function is much lower than unity on hydrophobic surfaces, indicating a low evaporation rate of droplets in the array. The findings of this study are expected to advance our understanding of droplet evaporation in arrays in a wide range of scientific and engineering applications.

Item Type: Article
Additional Information: Funding Information: This work was supported by the Ministry of Education, Science and Culture of the Japanese Government through the Grant-in Aid for Scientific Research, Project No. 22H01416, and the Initiative for Realizing Diversity in the Research Environment by the Ministry of Education, Culture, Sports, Science and Technology, Japan.
Uncontrolled Keywords: computational mechanics,condensed matter physics,mechanics of materials,mechanical engineering,fluid flow and transfer processes ,/dk/atira/pure/subjectarea/asjc/2200/2206
Faculty \ School: Faculty of Science > School of Engineering
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Depositing User: LivePure Connector
Date Deposited: 27 Feb 2023 09:30
Last Modified: 26 Oct 2023 02:17
URI: https://ueaeprints.uea.ac.uk/id/eprint/91274
DOI: 10.1063/5.0137614

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