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Turbulent Heat Transfer in a Duct With Periodic Wall-Attached Round-Edge Ribs

[+] Author Affiliations
Majid Molki

Southern Illinois University at Edwardsville, Edwardsville, IL

Paper No. IMECE2003-41053, pp. 171-178; 8 pages
doi:10.1115/IMECE2003-41053
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

A computational effort was undertaken to study the effect of rounding of protruding edges of rectangular ribs on turbulent heat transfer and pressure drop in a duct. The computations were focused on turbulent flow with Reynolds number ranging from 5000 to 50,000. Three different fluids — air, water, and ethylene glycol — were considered in this investigation. This allowed Prandtl number to vary from 0.707 to 150.5. In this study, the edge radius of curvature was varied from zero (sharp edge) to 1/2 of the rib height. The computations were performed using the control-volume approach, SIMPLE algorithm, and QUICK scheme. The results for the round-edge ribs with constant wall heat flux indicated a slight enhancement of the rib-average heat transfer coefficient. The maximum and average enhancements were 8.6% and 2.6%, respectively, with a standard deviation of 2.3% for 75 computational data points. The total rate of heat transfer, however, decreased by 8.6% due to lower surface area of the round-edge ribs. The heat transfer results were correlated in terms of Reynolds number, Prandtl number, and radius of curvature. Pressure drops were also computed and are reported in this paper.

Copyright © 2003 by ASME

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