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

Authors

Budiarso Budiarso, Mechanical Engineering Department, University of Indonesia, Depok 16424, IndonesiaFollow
Keizo Watanabe, Department of Mechanical Engineering, Graduate School of Engineering, Tokyo Metropolitan University Minami Ohsawa, Hachiooji-shi, Tokyo 192-0397, Japan
Satoshi Ogata, Department of Mechanical Engineering, Graduate School of Engineering, Tokyo Metropolitan University Minami 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.

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Recommended Citation

Budiarso, Budiarso; Watanabe, Keizo; and Ogata, Satoshi (2007) "Limiting Maximum Drag Reduction Asymptote for the Moment Coefficient of an Enclosed Rotating Disk with Fine Spiral Grooves," Makara Journal of Technology: Vol. 11: Iss. 2, Article 7.
DOI: 10.7454/mst.v11i2.531
Available at: https://scholarhub.ui.ac.id/mjt/vol11/iss2/7