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TECHNICAL PAPERS

Measurements Within Vortex Cores in a Turbulent Jet

[+] Author and Article Information
Amit Agrawal, Ajay K. Prasad

Department of Mechanical Engineering, University of Delaware, Newark, DE 19716

J. Fluids Eng 125(3), 561-568 (Jun 09, 2003) (8 pages) doi:10.1115/1.1568357 History: Received March 13, 2002; Revised September 15, 2002; Online June 09, 2003
Copyright © 2003 by ASME
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References

Figures

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Velocity and vorticity distributions in (a) a real and (b) a Rankine vortex (adapted from Kundu 4)
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(a) Instantaneous, (b) low-pass filtered, and (c) high-pass filtered vector fields (1 grid unit=2 mm)
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Variation in the number of vortices in successive PIV frames for a typical run
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Curve fits to number of vortices of different sizes (1 grid unit=2 mm)
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Vorticity obtained by differentiating (a) instantaneous and (b) high-pass filtered field with overlaid high-pass field vectors
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Normalized circulation within vortices of radii R=3 grid units (total 222 vortices)
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Variation of average circulation within vortex cores for vortices of varying radii (1 grid unit=2 mm). See Table 2 for the values of the relative uncertainty in Γ.
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Polynomial fits to average circulation for vortex radius=three grid units
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Variation of average tangential velocity within vortex cores for vortices of varying radii. See Table 2 for the values of the relative uncertainty in vθ.
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Variation of average vorticity within vortex cores for vortices of varying radii. See Table 2 for the values of the relative uncertainty in ω.
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Normalized vorticity within vortices of different radii
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Variation of average centrifugal force within vortex cores for vortices of varying radii
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Average energy associated with different vortex radii

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