Experimental study on drag reduction characteristic of hydrogels flexible surfaces with sparse groove

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  • (Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China)

Received date: 2025-01-09

  Revised date: 2025-01-09

  Accepted date: 2025-01-09

  Online published: 2025-01-09

Abstract

Polyvinyl alcohol hydrogel flexible surface is used as drag reducing material, and sodium alginate and hydroxypropyl methyl cellulose are added to enhance its elasticity and mechanical strength. Test the drag reduction effect of different spacing flow direction groove flexible surfaces and vertical flow direction groove flexible surfaces using the rotating disk drag measurement method, and analyze their impact mechanism on the disk drag reduction effect. The results show that the hydrogel flexible surface without grooves has a good drag reduction effect in laminar flow, but it will lose the drag reduction effect in turbulent flow and play the role of drag increase. The two kinds of hydrogel flexible surfaces with sparse grooves have higher drag reduction rate in laminar flow, and can also maintain drag reduction effect in high Reynolds number turbulent state, which don’t have the effect of increasing resistance.

Cite this article

CHEN Weilong, SU Fengmin, WANG Zhanyuan, CHANG Chao, PENG Benli . Experimental study on drag reduction characteristic of hydrogels flexible surfaces with sparse groove[J]. Journal of Dalian Maritime University, 2025 , 51(2) : 135 -142 . DOI: 10.16411/j.cnki.issn1006-7736.2025.02.015

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