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Research Papers: Fundamental Issues and Canonical Flows

Study of a Turbulent Dual Jet Consisting of a Wall Jet and an Offset Jet

[+] Author and Article Information
Amitesh Kumar

Department of Biotechnology & Medical Engineering,  National Institute of Technology, Rourkela, Odisha, India 769008

Manab Kumar Das1

Department of Mechanical Engineering,  Indian Institute of Technology, Kharagpur, West Bengal, India 721302manab@mech.iitkgp.ernet.in

1

Corresponding author.

J. Fluids Eng 133(10), 101201 (Sep 26, 2011) (11 pages) doi:10.1115/1.4004823 History: Received February 11, 2010; Revised September 23, 2011; Published September 26, 2011; Online September 26, 2011

The study of a two-dimensional, steady, incompressible, turbulent flow of a dual jet consisting of a wall jet and an offset jet has been simulated numerically. The standard high Reynolds number two-equation k-ɛ model is used as the turbulence model. The Reynolds number is considered as 20000 for all the computations because the flow becomes fully turbulent. The merge point and the combined point have been obtained and compared with other results. The central streamline has been plotted and observed to follow an arc of a circle. The momentum flux has been computed along the axial length for the wall jet, offset jet and the dual jet and compared. A similarity profile has been obtained in the downstream direction. A detailed discussion has been provided on the pressure field, Reynolds stress, kinetic energy and its dissipation rate. The jet growth rate in terms of half-width, the decay of maximum velocity and the jet width are presented

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Comparison of the central streamline of jet with Tanaka [9]

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Figure 3

Term-by-term evaluation of the momentum fluxes and comparison with Spall [21]

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Figure 4

Grid independence test

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Figure 5

Typical grid distribution zoomed near the offset plate

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Figure 6

Streamline and velocity vector distribution

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Figure 7

Spanwise distribution of velocity for an offset ratio = 9

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Figure 8

Location of the vortex center and the merge point

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Figure 9

Contour plot of the ∂U∂Y in the domain

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Figure 10

Contour plots of the normalized Reynolds stresses for the dual-jet flow. (Solid lines positive, dashed lines negative)

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Figure 11

Turbulence stress u'2¯ distribution at different axial distances

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Figure 12

U-contour distribution in the domain

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Figure 13

V-contour distribution in the domain

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Figure 14

Pressure contour distribution in the domain (× 103 )

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Figure 15

Span-wise distribution of static pressure for an offset ratio = 9 (×103 )

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Figure 16

Kinetic energy contour distribution

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Figure 17

Dissipation contour distribution ×103

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Figure 18

Curvature of the central streamline and merge point for dual jet separation 9 and an offset ratio = 9.5

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Figure 19

Momentum flux distribution along the axial direction for wall jet, offset jet and dual jet

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Figure 20

Similarity solution for the dual jet

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Figure 21

Similarity solution at different stream-wise locations

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Figure 22

Profiles of the development of Y(0.5)1, Y(0.5)2 and Y(0.5)3 with downstream distance

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Figure 23

Decay of Umax with downstream distance

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Figure 24

Growth of jet width

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Figure 1

Schematic diagram of a dual jet comprising of an offset and a wall jet

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