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RESEARCH PAPER

Effect of Elevated Free-Stream Turbulence on Transitional Flow Heat Transfer Over Dual-Scaled Rough Surfaces

[+] Author and Article Information
Ting Wang

Energy Conversion and Conservation Center, University of New Orleans, New Orleans, LA 70148-2220

Matthew C. Rice

Borg Warner Turbo Systems, 1849 Brevard Road, Arden, NC 28704

J. Heat Transfer 127(4), 393-403 (Mar 30, 2005) (11 pages) doi:10.1115/1.1861920 History: Received March 21, 2004; Revised September 27, 2004; Online March 30, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic diagrams of experimental facility: (a) overview of wind tunnel and test section; (b) thermocouple layout on test surface; (c) cross-section detail of heated test surface
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Layout of roughness conditions. The step change between two roughness regions is near the second thermocouple location for 40-grit sand paper cases and is upstream of the first thermocouple for the cylinder cases.
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(a) and (b) Comparison of leading edge and downstream surface roughness cases at 7.0 m/s without a grid
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Conceptual drawings of flow past two different flow disturbances: (a) flow past an isolated hemisphere (Acarlar and Smith 23); (b) flow past a backward-facing step (Ruderich and Fernholz 24); (c) flow past backward-facing step with downstream roughness, (d) flow past a hemisphere and surrounding roughness
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Comparison of leading edge roughness for 4.6 m/s without a grid
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Effect of FSTI on smooth wall cases at 4.6 m/s
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Effect of FSTI on smooth wall cases at 7.0 m/s
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Comparison of smooth and rough wall cases at 7.0 m/s with grid 1 (FSTI ∼4%)
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Comparison of smooth and rough wall cases with grid 2 (FSTI∼6%) at 7.0 m/s
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Comparison of smooth and rough wall cases at 4.6 m/s with grid 2 (FSTI∼5%)
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Comparison of smooth and rough wall cases at 4.6 m/s with grid 2 (FSTI∼5%)
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Comparison of smooth and rough wall cases at 4.6 m/s with grid 2 (FSTI∼5%)
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Free-stream integral length scale distributions
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Free-stream distributions of v/u
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Streamwise velocity fluctuation distributions in boundary layer at y=1 mm with grid 2 at 4.6 m/s
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Power spectrum density (PSD) function of the 40/0/4.9 case in boundary layers at y=1 mm with grid 2 at 4.6 m/s
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Streamwise velocity fluctuation distributions in boundary layer at y=1 mm with grid 2 at 7.0 m/s
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PSD function of 40/100/6.0 case in boundary layers at y=1 mm with grid 2 at 7.0 m/s
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Cross-stream velocity fluctuations in boundary layers at y=1 mm with grid 2 at 4.6 m/s
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Cross-stream velocity fluctuations in boundary layers at y=1 mm with grid 2 at 7.0 m/s
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Normalized Reynolds shear stress distributions in boundary layers at y=1 mm with grid 2 at 4.6 m/s
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Normalized Reynolds shear stress distributions with grid 2 at 7.0 m/s

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