Predicting the drop size passing through a superhydrophobic orifice

Superhydrophobic surfaces can be utilized in various applications, such as enhanced heat transfer, anti-icing, self-cleaning, and viscous drag reduction. In this work, we investigated the water droplet size separation using superhydrophobic surfaces, which is relatively new and unexplored research f...

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Bibliographic Details
Published in:Physics of fluids (1994) 2022-11, Vol.34 (11)
Main Authors: Jereb, Samo, Zupančič, Matevž, Može, Matic, Golobič, Iztok
Format: Article
Language:English
Subjects:
Deicing
Drag reduction
Drop size
Droplets
Hydrophobic surfaces
Hydrophobicity
Laser beam cutting
Medical research
Metal foils
Model accuracy
Orifices
Size separation
Viscous drag
Water drops
Wettability
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Summary:Superhydrophobic surfaces can be utilized in various applications, such as enhanced heat transfer, anti-icing, self-cleaning, and viscous drag reduction. In this work, we investigated the water droplet size separation using superhydrophobic surfaces, which is relatively new and unexplored research field, but yet promising for pharmaceutical and medical applications. We developed a theoretical model for predicting the diameter of a droplet passing through a smaller superhydrophobic orifice by considering the balance of forces, geometrical characteristics, and the surface wettability. For verification of the model, experimental water droplet size separation was conducted using a thin superhydrophobic copper foil with a laser-cut orifice with a diameter ranging from 1.2 to 2.1 mm. A comparison of the experimental and analytical results has shown that the error of the model is less than 20% within the model's validity range with the upper limit at the capillary length of the fluid. By moving away from this limit toward smaller droplet diameters, the accuracy of the model improves and reaches an error of less than 7% at the smallest used orifice diameter of 1.2 mm.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0125906