Polymer-dominant drag reduction in turbulent channel flow over a superhydrophobic surface

In this study, we focused on the integration of a flexible polymer (polyacrylamide) and a (randomly patterned) superhydrophobic surface in a large-scale turbulent channel flow rig to investigate their combined drag reduction effectiveness. Experimental results indicate that, prior to degradation, po...

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Bibliographic Details
Published in:Physics of fluids (1994) 2023-12, Vol.35 (12)
Main Authors: Garcia-Gonzalez, Reyna I., Crick, Colin R., Ng, Henry C.-H., Poole, Robert J.
Format: Article
Language:English
Subjects:
Additives
Channel flow
Drag reduction
Fluid dynamics
Hydrophobicity
Polyacrylamide
Polymers
Turbulent flow
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Summary:In this study, we focused on the integration of a flexible polymer (polyacrylamide) and a (randomly patterned) superhydrophobic surface in a large-scale turbulent channel flow rig to investigate their combined drag reduction effectiveness. Experimental results indicate that, prior to degradation, polyacrylamide (at a 100-ppm concentration) and superhydrophobic surfaces individually manifest drag reductions of 35% and 7%, respectively. However, when combined, the influence of polymer additives remained consistent, with the introduction of superhydrophobic surfaces yielding negligible differences. A clear predominance was evidenced in our facility looking at realistic pressure for applications, with polymer additives overshadowing the impact of superhydrophobic surfaces.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0176377