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TECHNICAL PAPERS: Forced Convection

An Improved Numerical Study of the Wall Effect on Hot-Wire Measurements

[+] Author and Article Information
Jun-Mei Shi, Michael Breuer, Franz Durst

Lehrstuhl für Strömungsmechanik, Universität Erlangen-Nürnberg, Cauerstr. 4, D-91058 Erlangen, Germany

Michael Schäfer

Numerische Berechnungsverfahren im Maschinenbau, Technische Universität Darmstadt, Petersenstraße 30, D-64287 Darmstadt, Germany

J. Heat Transfer 125(4), 595-603 (Jul 17, 2003) (9 pages) doi:10.1115/1.1571848 History: Received September 11, 2002; Revised March 03, 2003; Online July 17, 2003
Copyright © 2003 by ASME
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References

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Figures

Grahic Jump Location
Sketch of the physical model for the investigation of HWA near-wall measurements
Grahic Jump Location
Comparison of the average Nusselt number Nu of a hot wire in cross-flow of a free stream, close to an aluminum wall and at different overheat ratios, τ=1.27 and 1.5; kw*=9186,Y/D=100,D=5 μm
Grahic Jump Location
Effect of the overheat ratio τ (=1.27 and 1.5) on HWA near-wall measurements close to an aluminum wall, kw*=9186,Y/D=100,D=5 μm
Grahic Jump Location
Comparison of the present results at very small Reynolds numbers with classical results from the literature
Grahic Jump Location
Comparison of the present results for the apparent velocity Uappa+ in the case of an aluminum wall with those of Shi et al. 6; kw*=9186,Y/D=100,D=5 μm
Grahic Jump Location
Comparison of the numerical results of the velocity reading Uappa+ of the hot wire close to mirror glass walls (kw*=29.6) obtained by using different model configurations
Grahic Jump Location
The average Nusselt number Nu of a hot wire in near-wall cross-flow for various Y/D,D=5 μm, τ=1.27: (a) aluminum wall (kw*=9186); and (b) mirror glass wall (kw*=29.6).
Grahic Jump Location
Velocity reading of the wire, comparison between various D+(=UτD/ν) varied by the shear velocity Uτ or Y/D, where D+(=Y+/(Y/D),D=5 μm and τ=1.27. H and S are irrelevant in the case of an aluminum wall: (a) aluminum wall (kw*=9186); and (b) mirror glass wall (kw*=29.6).

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