Vol 11, No 2 (2007) > Articles >

Limiting Maximum Drag Reduction Asymptote for the Moment Coefficient of an Enclosed Rotating Disk with Fine Spiral Grooves

Budiarso Budiarso 1 , Keizo Watanabe 2 , Satoshi Ogata 2

Affiliations:

  1. Mechanical Engineering Department, University of Indonesia, Depok 16424, Indonesia
  2. Department of Mechanical Engineering, Graduate School of Engineering, Tokyo Metropolitan UniversityMinami Ohsawa, Hachiooji-shi, Tokyo 192-0397, Japan

 

Abstract:

In this study, the limiting maximum drag reduction asymptote for the moment coefficient of an enclosed rotating disk with fine spiral grooves in turbulent flow region were obtained analytically. Analysis which were based on an assumption for a simple parabolic velocity distribution of turbulent pipe flow to represent relative tangential velocity, was carried out using momentum integral equations of the boundary layer. For a certain K- parameter the moment coefficient results agree well with experimental results for maximum drag reduction in an enclosed rotating disk with fine spiral grooves and drag reduction ratio approximately was 15 %. Additionally, the experimental results for drag reduction on a rotating disk can be explained well with the analytical results.

Keywords: drag reduction, boundary layer, enclosed rotating disk, friction moment
Published at: Vol 11, No 2 (2007) pages: 92-96
DOI:

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