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TECHNICAL PAPERS: Heat Transfer Enhancement

Moving and Rotating Sphere in the Thermal Entrance Region of a Heated Pipe

[+] Author and Article Information
N. Shahcheraghi, H. A. Dwyer

Mechanical and Aeronautical Engineering Department, University of California, Davis, CA 95616

J. Heat Transfer 122(2), 336-344 (Dec 10, 1999) (9 pages) doi:10.1115/1.521469 History: Received January 05, 1999; Revised December 10, 1999
Copyright © 2000 by ASME
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References

Figures

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Basic arrangement for the moving and rotating sphere inside the pipe
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(a) Typical Chimera grid with holes (hollow squares) and fringe points (solid squares) (b) Typical Chimera grid used in this study
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Sphere surface pressure, Rep=25, Ds/Dp=0.4
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(a) Local friction factor on sphere surface at various angles, Rep=25, Ds/Dp=0.4 (b) Local friction factor contours on sphere surface, Rep=25, DR=0.4
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Stream lines in the plane of symmetry, Rep=25, Ds/Dp=0.4
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Sphere Nusselt Number, Nus, versus distance, X*, from pipe thermal entrance
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Sphere temperature, TS*, versus distance, X*, from pipe thermal entrance
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(a) Local Nu around the sphere at various angles, Rep=25, Ds/Dp=0.4, X*=0.0 (b) Local Nu around the sphere at various angles, Rep=25, Ds/Dp=0.4, X*=0.168
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Nusselt number contours on sphere surface, Rep=25, Ds/Dp=0.4, X*=0.0 (a) and X*=0.168 (b)
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(a) Convergence history for the velocity field (b) Convergence history for the pressure correction variable, ϕ

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