JOURNAL ARTICLE

Development and performance of a gelatin-based bio-polysaccharide drag reduction coating.

  • Published In: Physics of Fluids, 2023, v. 35, n. 5. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Xie, Luo; Jiang, Lang; Meng, Fan-Zhe; Li, Qiang; Wen, Jun; Hu, Hai-Bao 3 of 3

Abstract

This article focuses on the development and evaluation of gelatin-based bio-polysaccharide composite coatings for drag reduction in turbulent flow, inspired by the mucus secreted by fast-swimming fish. Five bio-polysaccharides—guar gum (GG), xanthan gum (XG), locust bean gum (LBG), tragacanth gum (TG), and acacia gum (AG)—were incorporated into gelatin coatings applied on polymethyl methacrylate (PMMA) plates, with drag reduction rates exceeding 20% in laboratory tests. The drag reduction mechanisms involve polymer-induced turbulence modification (the "Toms effect"), formation of a slippery liquid layer reducing wall shear, and surface flexibility, while surface roughness can increase drag. The study highlights the complex interplay between gelatin concentration, polysaccharide type and proportion, and coating microstructure in optimizing drag reduction, suggesting further research to clarify these mechanisms for practical underwater applications.

Additional Information

  • Source:Physics of Fluids. 2023/05, Vol. 35, Issue 5, p1
  • Document Type:Article
  • Subject Area:Chemistry
  • Publication Date:2023
  • ISSN:1070-6631
  • DOI:10.1063/5.0149281
  • Accession Number:164088264
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