What is it about?
Hydrogels are soft materials with superhydrophilic properties and steady-state solvation interfaces, but the relationship between the drag reduction behavior and the hydrogel-liquid interaction is still unclear. This paper examines the drag reduction performance of hydrogel coatings with controllable thickness and proposes the corresponding drag reduction mechanism.
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Why is it important?
The hydration layer on the hydrogel surface delayed the spontaneous dissipation of momentum from the upper fluid layer and improved the efficiency of momentum transfer between fluid layers. Besides, the diffusion behavior of hydrogel-fluid interface enhanced the hydrodynamic lubrication performance and greatly decreased the fluid resistance of highly hydrated surface.
Perspectives
The wetting properties of superhydrophilic interface creatively eliminated the thermodynamic instability exhibited by the liquid-repellent surfaces. It is therefore promising to provide preliminary exploration for investigating the dynamic interaction of hydrophilic substrate-liquid interface and developing steady state interfacial drag reduction techniques.
Xiaotong Wu
Nanchang University
Read the Original
This page is a summary of: Interfacial mechanism of hydrogel with controllable thickness for stable drag reduction, Friction, November 2023, Tsinghua University Press,
DOI: 10.1007/s40544-023-0744-z.
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