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PIV/PLIF experiments of jet mixing in a model of a rotary kiln

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Abstract

The jet mixing in a downscaled, isothermal model of a rotary kiln is investigated experimentally through simultaneous particle image velocimetry and planar laser-induced fluorescence measurements. The kiln is modeled as a cylinder with three inlets in one end, two semicircular-shaped inlets for what is called the secondary fluid divided by a wall in between, called the back plate, where the burner nozzle is located. The scaling of the burner nozzle between real kiln and model and the corresponding jet flow through it is determined by the Craya–Curtet parameter. Three momentum flux ratios of the secondary fluid are investigated, and the interaction with the burner jet is scrutinized. It is found that the burner jet characteristics, its mixing with the secondary fluid and the resulting flow field surrounding the jet are dependent on the momentum flux ratio. A particular result is that stable shear layers give a more even mixing as compared to a case with shear layers subjected to a more prominent vortex shedding.

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Acknowledgments

This work was carried out within the framework of the Faste Laboratory, a VINNOVA Excellence Center for Functional Product Innovation and the program “Effektivisering av industrins energianvändning—forskning och utveckling” run by the Swedish Energy Agency. The authors also acknowledge discussions with LKAB, who also partly financed the work. Finally, a special thanks to the reviewers whose comments considerably strengthened the final draft of this manuscript.

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Authors and Affiliations

  1. Division of Fluid and Experimental Mechanics, Luleå University of Technology, 97187, Luleå, Sweden

    I. A. Sofia Larsson, Simon P. A. Johansson & T. Staffan Lundström

  2. Luossavaara-Kiirunavaara AB (publ), 981 86, Kiruna, Sweden

    B. Daniel Marjavaara

Authors
  1. I. A. Sofia Larsson
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  2. Simon P. A. Johansson
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  3. T. Staffan Lundström
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  4. B. Daniel Marjavaara
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Correspondence to I. A. Sofia Larsson.

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Larsson, I.A.S., Johansson, S.P.A., Lundström, T.S. et al. PIV/PLIF experiments of jet mixing in a model of a rotary kiln. Exp Fluids 56, 111 (2015). https://doi.org/10.1007/s00348-015-1984-9

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  • DOI: https://doi.org/10.1007/s00348-015-1984-9

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