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Quantitative planar imaging of turbulent buoyant jet mixing

Published online by Cambridge University Press:  09 December 2009

L. K. SU ,
D. B. HELMER  and
C. J. BROWNELL
L. K. SU*
Affiliation:
Applied Fluid Imaging Laboratory, Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
D. B. HELMER
Affiliation:
Applied Fluid Imaging Laboratory, Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
C. J. BROWNELL
Affiliation:
Applied Fluid Imaging Laboratory, Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
*
†Email address for correspondence: [email protected]
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Abstract

Planar Rayleigh scattering provides quantitative mixing measurements in the developing region of axisymmetric turbulent helium jets issuing into air. The measurements focus on the relatively near field, in which the jets are primarily momentum driven. The imaging parameters are specified to ensure high spatial resolution. The mean jet fluid concentration fields attain self-similarity within the measurement region, though the forms of the mole fraction profiles indicate a reduction in turbulent transport at the jet outer boundary, arising from the reduced jet fluid density. Nevertheless, jet-like scaling pertains for the concentration fields. Mass fraction fluctuations on the jet centreline attain the expected asymptotic value of ≈23% of the centreline mass fraction values. The scalar dissipation rates, however, show an axial decay rate that is slower than theoretical predictions. The two-dimensional extent of the measurements also allows spatial filtering similar to that inherent in large-eddy simulations (LESs). The results confirm that fluctuation levels and scalar dissipation rates determined for the filtered fields are reduced as the effective resolution is reduced, but while the fluctuation profiles for the filtered fields are similar for the different filter sizes, the forms of the scalar dissipation profiles are highly dependent on filter size. These latter results in particular are of a form that will be useful for grid-dependent assessments of LES results.

JFM classification

Mixing: Turbulent mixing Reacting Flows: Turbulent reacting flows Wakes/Jets: Wakes/Jets
Type
Papers
Information
Journal of Fluid Mechanics , Volume 643 , 25 January 2010 , pp. 59 - 95
Copyright
Copyright © Cambridge University Press 2009

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Footnotes

‡

Present address: Mechanical Engineering Department, Stanford University, Stanford, CA 94305, USA

Present address: Department of Mechanical Engineering, United States Naval Academy, Annapolis, MD, 21402, USA

References

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