Heat Transfer and Pressure Drop Correlations for Square Channels With V-Shaped Ribs at High Reynolds Numbers
- 16 September 2011
- journal article
- Published by ASME International in Journal of Heat Transfer
- Vol. 133 (11), 111901
- https://doi.org/10.1115/1.4004207
Abstract
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+).Keywords
This publication has 21 references indexed in Scilit:
- Heat Transfer and Pressure Drop Measurements for a Square Channel With 45 deg Round-Edged Ribs at High Reynolds NumbersJournal of Turbomachinery, 2010
- Heat Transfer in a Two-Pass Rectangular Channel (AR=1:4) Under High Rotation NumbersJournal of Heat Transfer, 2008
- PIV flow measurements for heat transfer characterization in two-pass square channels with smooth and 90° ribbed wallsInternational Journal of Heat and Mass Transfer, 2002
- Detailed heat transfer distributions in two-pass square channels with rib turbulatorsInternational Journal of Heat and Mass Transfer, 1997
- Darryl E. Metzger Memorial Session Paper: Experimental Heat Transfer and Friction in Channels Roughened With Angled, V-Shaped, and Discrete Ribs on Two Opposite WallsJournal of Turbomachinery, 1996
- Heat transfer performance comparisons of five different rectangular channels with parallel angled ribsInternational Journal of Heat and Mass Transfer, 1992
- High performance heat transfer ducts with parallel broken and V-shaped broken ribsInternational Journal of Heat and Mass Transfer, 1992
- Augmented Heat Transfer in Square Channels With Parallel, Crossed, and V-Shaped Angled RibsJournal of Heat Transfer, 1991
- Effects of V-shaped rib arrays on turbulent heat transfer and friction of fully developed flow in a square channelInternational Journal of Heat and Mass Transfer, 1991
- Developing heat transfer in rectangular channels with rib turbulatorsInternational Journal of Heat and Mass Transfer, 1988