Understanding droplet collision with superhydrophobic-hydrophobic–hydrophilic hybrid surfaces

Sotoudeh, F., Kamali, R., Mahmood Mousavi, S., Karimi, N. , Lee, B. J. and Khojasteh, D. (2021) Understanding droplet collision with superhydrophobic-hydrophobic–hydrophilic hybrid surfaces. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 614, 126140. (doi: 10.1016/j.colsurfa.2021.126140)

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Abstract

This study uses a two-phase finite volume method to investigate the dynamics of Newtonian and non-Newtonian droplets impacting onto hybrid surfaces with various wettabilities. Six configurations with different substrate contact angles are tested ranging from hydrophilic, hydrophobic, and superhydrophilic as well as a combination of them. The temperature-dependent properties are applied to model the Newtonian droplets, and the Arrhenius law which is a relation between viscosity and shear rate is incorporated for the non-Newtonian rheology. The results show that for a hybrid surface with linear wettabilities varying from hydrophilic to hydrophobic to superhydrophobic, the maximum spreading factor is larger for both Newtonian and non-Newtonian droplets in comparison to any other surface configurations considered in this study. However, this spreading factor is minimum when a stepwise superhydrophobic-hydrophobic-hydrophilic hybrid surface is examined. Further, the residence time of Newtonian droplet has the maximum value when collides upon a hybrid surface with linear wettability distribution ranging from hydrophilic to superhydrophobic. However, the maximum value of residence time for the non-Newtonian droplet is achieved when the stepwise pattern of hydrophilic to superhydrophobic is adopted.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Karimi, Dr Nader
Creator Roles:
Karimi, N.Conceptualization, Writing – review and editing, Supervision
Authors: Sotoudeh, F., Kamali, R., Mahmood Mousavi, S., Karimi, N., Lee, B. J., and Khojasteh, D.
College/School:College of Science and Engineering > School of Engineering
Journal Name:Colloids and Surfaces A: Physicochemical and Engineering Aspects
Publisher:Elsevier
ISSN:0927-7757
ISSN (Online):1873-4359
Published Online:16 January 2021
Copyright Holders:Copyright © 2021 Elsevier B.V.
First Published:First published in Colloids and Surfaces A: Physicochemical and Engineering Aspects 614: 126140
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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