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TECHNICAL PAPERS

Numerical Prediction of Hot-Wire Corrections Near Walls

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

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

J. Fluids Eng 124(1), 241-250 (Sep 13, 2001) (10 pages) doi:10.1115/1.1429636 History: Received January 07, 2000; Revised September 13, 2001
Copyright © 2002 by ASME
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References

Figures

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Computational domain and boundary conditions
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Example of a computational grid (Y/D=100) and zoom of the locally refined region at the third grid level (of a total of five multigrid levels)
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Comparison of numerical and experimental values of the velocity correction factor CU in cases of highly conducting walls, D=5 μm if not given
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Comparison of numerical and experimental values of the velocity correction factor CU in cases of walls with low conductivities
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Summary of the numerical values of the velocity correction factor CU for different wall materials
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Total velocity (V+=u2+v2/Uτ) around the wire for Y/D=10 and Re=0.001, resulting in Y+=0.1, and for kw*=1
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Schematic temperature influence region of a hot-wire and the heat exchange process between the fluid and the solid wall at various wire-to-wall distances Y+
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Isotherms (°C) around the wire and in the wall with a wire-to-wall distance Y+=10 (mirror glass, kw*=29.6,Y/D=100 and ReD=1),CU≈1
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Isotherms (°C) around the wire and in the wall with a wire-to-wall distance Y+=3.16 (mirror glass, kw*=29.6,Y/D=100 and ReD=0.1),CU>1
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Isotherms (°C) around the wire and in the wall with a wire-to-wall distance Y+=0.63 (mirror glass, kw*=29.6,Y/D=100 and ReD=0.004),CU<1
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Predicted apparent velocity values for a hot-wire close to walls of different materials

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