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TECHNICAL PAPERS

Flow Field Measurement in a Crossflowing Elevated Jet

[+] Author and Article Information
Nejla Mahjoub Said

Laboratoire de Mécanique des Fluides et Thermique, Ecole Nationale d’Ingénieurs de Monastir, Route de Ouardanine 5020 Monastir, TunisieNejla.Mahjoub@fsm.rnu.tn

Sabra Habli, Hatem Mhiri

Laboratoire de Mécanique des Fluides et Thermique, Ecole Nationale d’Ingénieurs de Monastir, Route de Ouardanine 5020 Monastir, Tunisie

Hervé Bournot, Georges Le Palec

Equipe IMFT, Institut de Mécanique de Marseille, UNIMECA, 60 rue Joliot-Curie, Technopôle de Château-Gombert, 13453 Marseille Cedex 13, France

J. Fluids Eng 129(5), 551-562 (Oct 14, 2006) (12 pages) doi:10.1115/1.2717614 History: Received August 28, 2005; Revised October 14, 2006

Structural features resulting from the interaction of a turbulent round jet issuing transversely into a uniform stream are described with the help of flow visualization and the PIV technique. The jet exits from a rigidly mounted pipe projecting at a distance from the floor of a tunnel. The aim of the present work is to investigate the flow structure in the near-field jet-pipe exit. Jet-to-crossflow velocity ratios from 0.375 to 3 were revealed at Reynolds numbers from 1660 to 6330. Flows in the vertical symmetry plane and horizontal plane across the jet-wake, jet-exit, and pipe-wake regions are investigated. The measured velocity fields present quantitative characteristics of the streamlines, vortices, and topological features of the flow structures. In particular, the origin and formation of the vortices in the wake are described and shown to be fundamentally different from the well-known phenomenon of vortex shedding from solid bluff bodies.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Definition sketch

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Figure 2

Experimental setup: PIV

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Figure 3

Experimental setup: Tomography laser

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Figure 4

Different types of vortical structure associated with the transverse-jet near field, u∞=3ms−1, v0=8ms−1, Re=5330

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Figure 5

(i) Flow visualization; (ii) mean velocity field; (iii) mean vorticity field, R<1

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Figure 6

(i) Flow visualization; (ii) mean velocity field; (iii) mean vorticity field, R=1

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Figure 7

(i) Flow visualization; (ii) mean velocity field; (iii) mean vorticity field, R>1

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Figure 8

Crossflow effects, Re=5330

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Figure 9

Mean ṽ-velocity profiles above the exit jet at y=0.11m for v0=9.5ms−1 and various u∞

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Figure 10

Mean ũ-velocity profiles above the exit jet at y=0.11m for v0=9.5ms−1 and various u∞

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Figure 11

Kelvin-Helmholtz structures for different velocity ratio (PIV), at v0=7ms−1 and Re=3600

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Figure 12

Cross-sectional vorticities of the flow downstream elevated jet and their wakes (v0=3ms−1, u∞=1ms−1, Re=2000)

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Figure 13

Cross-sectional views, 1cm above the pipe exit

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Figure 14

(a) Mean velocity field; (b) instantaneous ṽ-velocity; (c) mean vorticity field; (d) instantaneous vorticity (v0=3ms−1, u∞=1ms−1, Re=2000)

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Figure 15

Mean ũ-velocity profiles for u∞=1ms−1 and v0=2.5ms−1 at y=0.11m and Re=1660 (at various sections z)

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Figure 16

Mean ũ-velocity profiles for u∞=1ms−1 and v0=2.5ms−1 at y=0.11m and Re=1660 (at various sections x)

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Figure 17

Mean w̃-velocity profiles for u∞=1ms−1 and v0=2.5ms−1 at y=0.11m and Re=1660 (at various sections x)

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