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Drag Reduction by Culture Solutions of Dry Malted Rice

[+] Author Affiliations
Keizo Watanabe

Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan

Satoshi Ogata

Tokyo Metropolitan University, Hachioji, Tokyo, Japan

Paper No. IMECE2009-10421, pp. 75-79; 5 pages
doi:10.1115/IMECE2009-10421
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

Turbulent drag reduction by culture solutions of dry malted rice was investigated in a 2.00mm-inner-diameter pipe flow of length 50 diameters at Reynolds numbers from 500 to 8000. The drag reducing abilities of the solutions were tested by comparing drag reduction effectiveness at different concentrations and culture times in water. Comparisons between polysaccharide biopolymer solutions and culture solutions of dry malted rice revealed that the test solutions exhibited Type B drag reduction, which were roughly parallel to, but displaced upwards from, the Newtonian Prandtl-Kármán law. The maximum drag reduction ration was about 30% at a Reynolds number of 8,000. It is shown also that the onset point of drag reduction phenomena was Ref = 200.

Copyright © 2009 by ASME
Topics: Drag reduction

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