Experimental Study of Turbulent Asymmetric Flow in a Flat Duct Symmetric Sudden Expansion

[+] Author and Article Information
F. Aloui

Faculté des Sciences et des Techniques, Dpt. de Physique-LGP (UPRES-EA 1152) 2, rue de la Houssinière, BP. 92208-44322 Nantes Cédex 03, France

M. Souhar

LEMTA (CNRS, UMR 7563)-ENSEM-INPL-2, av. de la Fore⁁t de Haye, BP. 160 54504 Vandoeuvre lès Nancy Cédex, France

J. Fluids Eng 122(1), 174-177 (Oct 13, 1999) (4 pages) doi:10.1115/1.483245 History: Received October 13, 1997; Revised October 13, 1999
Copyright © 2000 by ASME
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Schematic diagram of experimental apparatus (dimensions in mm)
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Three-dimensional view downstream pressure distribution under sudden expansion for U1=3.2 m/s (Re1=32,000;Re2=14208); uncertainty estimates: on p*: 7 percent, and Δξ=±0.01
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The RMS pressure contours (ln Pa) downstream of the sudden expansion for U1=3.2 m/s,Δp=50 Pa, (Re1=32,000;Re2=14,208); uncertainty estimates: RMS of p: 6 percent, and Δy*=±0.01
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Axial velocity profiles and the axial fluctuation rate before the sudden expansion for U1=3.2 m/s at ξ=−0.36; (Re1=32,000;Re2=14,208); uncertainty estimates: Ū: 2 percent, and on u/U: 12 percent
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Axial velocity profiles downstream of the sudden expansion, for U1=3.2 m/s (Re1=32,000;Re2=14,208); uncertainty estimates; Ū/U1 4 percent, and Δy=±0.2 mm
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(a) Separation boundaries between principal and recirculation flow. (b) General reorganization of flow downstream of the sudden expansion for U1=3.2 m/s, (Re1=32,000;Re2=14,208); uncertainty estimates on Fig. 6(a): 12 percent
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RMS-u contours (in m/s) downstream of the sudden expansion (ΔU=0.05 m/s) for U1=3.2 m/s; (Re1=32,000;Re2=14,208); uncertainty estimates: 10 percent




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