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All Journal Makara Journal of Technology
Keizo Watanabe, Keizo
Department of Mechanical Engineering, Graduate School of Engineering, Tokyo Metropolitan UniversityMinami Ohsawa, Hachiooji-shi, Tokyo 192-0397, Japan
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Limiting Maximum Drag Reduction Asymptote for the Moment Coefficient of an Enclosed Rotating Disk with Fine Spiral Grooves Budiarso, Budiarso; Watanabe, Keizo; Ogata, Satoshi
Makara Journal of Technology Vol. 11, No. 2
Publisher : UI Scholars Hub

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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.
Co-Authors Budiarso Budiarso, Budiarso Satoshi Ogata, Satoshi