SHIPPING LINES

According to Anders Malmstrom of Sweden, sailors are wasting their time when they polish the hull of a ship in the hope of making it move more smoothly through the water. So are civil engineers who specify a smooth bore in water conduits and aircraft designers who polish the wings of aircraft. According to the inventor, in PCT application 80/01673, there will be less friction loss if a working surface in contact with flowing fluid is covered with a grid of shallow protrusions angled to the direction of flow. The aim is to eliminate transverse fluid flow patterns which are caused by a complex combination of laminar friction and turbulence. The fluid streams off at an angle to the overall direction of flow or motion and this wastes energy. Malmstrom now claims that if intersecting ridges are formed in a grid on the working surface and the ridges are angled at 45 deg to the direction of fluid flow the unwanted transverse flow pattern is eliminated. The ridges need only be 1 mm in height to achieve the required effect. (No further information in article).

  • Availability:
  • Corporate Authors:

    IPC Magazine Limited

    King's Reach Tower, Stamford Street
    London SE1 9LS,   England 
  • Publication Date: 1980-12-11

Media Info

  • Pagination: p. 69
  • Serial:
    • NEW SCIENTIST
    • Volume: 88
    • Issue Number: 1231
    • Publisher: REED BUSINESS INFORMATION LTD
    • ISSN: 0262-4079

Subject/Index Terms

Filing Info

  • Accession Number: 00325825
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 15 1981 12:00AM