Drag reduction properties of superhydrophobic mesh pipes

Nicasio R. Geraldi, Linzi E Dodd, Ben B Xu, Gary G Wells, David Wood, Michael I Newton, Glen McHale

Research output: Contribution to journalArticlepeer-review


Even with the recent extensive study into superhydrophobic surfaces, the fabrication of such surfaces on the inside walls of a pipe remains challenging. In this work we report a convenient bi-layered pipe design using a thin superhydrophobic metallic mesh formed into a tube, supported inside another pipe. A flow system was constructed to test the fabricated bi-layer pipeline, which allowed for different constant flow rates of water to be passed through the pipe, whilst the differential pressure was measured, from which the drag coefficient (ƒ) and Reynolds numbers (Re) were calculated. Expected values of ƒ were found for smooth glass pipes for the Reynolds number (Re) range 750–10 000, in both the laminar and part of the turbulent regimes. Flow through plain meshes without the superhydrophobic coating were also measured over a similar range (750  
Original languageEnglish
Article number34001
JournalSurface Topography: Metrology and Properties
Issue number3
Publication statusPublished - 4 Jul 2017


  • drag reduction
  • flow
  • superhydrophobicity
  • mesh
  • pipes
  • internal flow


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