Flow and Heat Transfer in Convectively Cooled Underground Electric Cable Systems: Part 1—Velocity Distributions and Pressure Drop Correlations

[+] Author and Article Information
J. C. Chato

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, Ill.

R. S. Abdulhadi

Department of Mechanical Engineering, University of Jordan, Amman, Jordan

J. Heat Transfer 100(1), 30-35 (Feb 01, 1978) (6 pages) doi:10.1115/1.3450499 History: Received August 20, 1976; Online August 11, 2010


Velocity distributions and pressure drop correlations have been obtained experimentally for a wide range of physical, flow, and thermal parameters in three models of oil-cooled underground electric cable systems. The flow can be considered as consisting of several, interconnected, parallel channels. If one of these is significantly larger in cross section, it will dominate the behavior of the entire system with velocities up to an order of magnitude greater than in the other channels. Laminar, fully developed flow exists at a dimensionless entrance length as low as x/D H = 100. The turbulent velocity profiles are essentially uniform in the larger, main channel, but not in the small channels with lower velocities. Laminar friction factors can be correlated with an equivalent Reynolds number, based on the main flow channel alone, as f e ·Ree = 30. Turbulent friction factors increase with increasing skid wire roughness ratios and approach the asymptotic values of 0.013 and 0.021 for roughness ratios 0.0216 and 0.0293, respectively. Cable heating had no noticeable effect on the friction factor correlations.

Copyright © 1978 by ASME
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