Heat transfer coefficients and friction factors are measured in a 45 deg V-shaped rib roughened square duct at high Reynolds numbers, pertaining to internal passages of land-based gas turbine engines. Reynolds numbers in this study range from 30,000 to 400,000, which is much higher than prior studies of V-shaped rib roughened channels. The dimensions of the channel are selected to ensure that the flow is in the incompressible regime. Blockage ratio e/D ranges from 0.1 to 0.18 and the spacing ratio P/e ranges from 5 to 10. Reported heat transfer coefficients are regionally averaged, measured by isothermal copper plates. Results show that the heat transfer enhancement decreases with increasing Reynolds number. The friction factor is found to be independent of the Reynolds number. The thermal performance decreases when the Reynolds number increases. 45 deg V-shaped ribs show a higher thermal performance than corresponding 45 deg angled ribs, consistent with the trend established in literature. Correlations for the Nusselt number and the friction factor as function of Re, e/D, and P/e are developed. Also developed are correlations for R and G (friction and heat transfer roughness functions, respectively) as a function of the roughness Reynolds number (e+).
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November 2011
This article was originally published in
Journal of Heat Transfer
Research Papers
Heat Transfer and Pressure Drop Correlations for Square Channels With V-Shaped Ribs at High Reynolds Numbers
Nawaf Y. Alkhamis,
Nawaf Y. Alkhamis
Turbine Heat Transfer Laboratory,
Texas A&M University
, College Station, TX 77843-3123
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Akhilesh P. Rallabandi,
Akhilesh P. Rallabandi
Turbine Heat Transfer Laboratory,
Texas A&M University
, College Station, TX 77843-3123
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Je-Chin Han
Je-Chin Han
Turbine Heat Transfer Laboratory,
e-mail: jc-han@tamu.edu
Texas A&M University
, College Station, TX 77843-3123
Search for other works by this author on:
Nawaf Y. Alkhamis
Turbine Heat Transfer Laboratory,
Texas A&M University
, College Station, TX 77843-3123
Akhilesh P. Rallabandi
Turbine Heat Transfer Laboratory,
Texas A&M University
, College Station, TX 77843-3123
Je-Chin Han
Turbine Heat Transfer Laboratory,
Texas A&M University
, College Station, TX 77843-3123e-mail: jc-han@tamu.edu
J. Heat Transfer. Nov 2011, 133(11): 111901 (8 pages)
Published Online: September 16, 2011
Article history
Received:
September 1, 2010
Revised:
April 16, 2011
Online:
September 16, 2011
Published:
September 16, 2011
Citation
Alkhamis, N. Y., Rallabandi, A. P., and Han, J. (September 16, 2011). "Heat Transfer and Pressure Drop Correlations for Square Channels With V-Shaped Ribs at High Reynolds Numbers." ASME. J. Heat Transfer. November 2011; 133(11): 111901. https://doi.org/10.1115/1.4004207
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