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Direct measurement of the turbulent fluxes of a passive scalar in impinging jets using simultaneous PIV AND LIF
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2009 (English)In: 39th AIAA Fluid Dynamics Conference, 2009, 2009-4010- p.Conference paper (Refereed)
Abstract [en]

Turbulent mixing of passive scalars in an impinging jet are studied experimentally and numerically. The experiments use simultaneous PIV/PLIF data to obtain data on the velocity and concentration fields in a circular impinging jet with nozzle to plate distance of five diameters. The distributions of the mean velocity, turbulent kinetic energy, mean concentration, concentration fluctuation, turbulent fluxes, turbulent diffusivity are obtained from the measured data. The information enables one to compare directly the validity of different models for the turbulent fluxes, e.g. GDM model, GGDM model. Large Eddy Simulation are used as complimentary for studying Schmidt number (Sc) effects. The results show that the simpler models for turbulent fluxes are inadequate for use in flows with large coherent structures. Also, under conditions turbulence that enhances mixing is not always adequate to maintain the homogeneity of the mixture, whereby Sc-number effects become evident. For such flows, models for turbulent fluxes that neglect Sc-effects are apparently inadequate.

Place, publisher, year, edition, pages
2009. 2009-4010- p.
, 39th AIAA Fluid Dynamics Conference
Keyword [en]
Impinging jets, PIV/PLIF, Turbulent flux modelling
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-152392ScopusID: 2-s2.0-78349284012ISBN: 978-156347975-5OAI: diva2:750901
39th AIAA Fluid Dynamics Conference, 22 June 2009 through 25 June 2009, San Antonio, TX, United States

QC 20140930

Available from: 2014-09-30 Created: 2014-09-26 Last updated: 2014-09-30Bibliographically approved

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