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Large-scale Coherent Structures in Turbulent Mixed Convective Air Flow

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Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM,volume 124)

Abstract

We report on an experimental study of mixed convective air flow in a cuboidal container with an inlet and outlet slot at \(\mathcal {A} r = 3.3\), \(\mathcal {R} e= 1.0 \times 10^4\), \(\mathcal {R} a= 2.4 \times 10^8\) at a fluid pressure of \(P = 11.6\,{\mathsf {bar}}\). Particle image velocimetry were performed with the objective to identify the dynamics of the large-scale circulations. In addition, we applied temperature measurements to determine the heat transport. Due to the unsteady nature of mixed convection in the present configuration, the velocity vector fields were subjected to a proper orthogonal decomposition in order to extract the predominant coherent structures. The analysis uncovers two structures consisting of three and four thermally induced large-scale circulations, which are arranged in longitudinal direction. Further, we found that the dynamics and the topology of the convection rolls strongly influences the heat transport between the container‘s inlet and outlet.

Keywords

  • Turbulent mixed convection
  • Proper orthogonal decomposition
  • Coherent structures
  • Large-scale circulation
  • Heat transport

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References

  1. Baïri, A.: Nusselt-Rayleigh correlations for design of industrial elements: experimental and numerical investigations of natural convection in tilted square air filled enclosure. Heat Mass Transf. 42, 56–63 (2008)

    Google Scholar 

  2. Berkooz, G., Holmes, P., Lumley, L.J.: The proper orthogonal decomposition in the analysis of turbulent flows. Annu. Rev. Fluid Mech. 25, 539–575 (1993)

    Google Scholar 

  3. Funfschilling, D., Brown, E., Ahlers, G.: Torsional oscillations of the large-scale circulation in turbulent Rayleigh-Bénard convection. J. Fluid Mech. 607, 119–139 (2008)

    Google Scholar 

  4. Linden, P.F.: The fluid mechanics of natural ventilation. Annu. Rev. Fluid Mech. 31, 201–238 (1999)

    Google Scholar 

  5. Prvulovic, D., Tolmac, S., Lambic, M.: Convection drying in the food industry. Agric. Eng. Int. CIGR Ejournal 9(9), 1–13 (2007)

    Google Scholar 

  6. Raffel, M., Willert, C.E., Kompenhans, J.: Particle Image Velocimetry. Springer, Berlin (1997)

    Google Scholar 

  7. Schmeling, D., Bosbach, J., Wagner, C.: Oscillations of the large-scale circulation in turbulent mixed convection in a closed rectangular cavity. Exp. Fluids, 54(5), 1–15. Springer-Verlag (2013). doi:10.1007/s00348-013-1517-3

  8. Silva Dias, P.L., Schubert, W.H., DeMaria, M.: Large-scale response of the tropical atmosphere to transientconvection. J. Atmos. Sci. 32(9), 1244–1252 (1983)

    Google Scholar 

  9. Sirovich, L.: Turbulence and the dynamics of coherent structures part I: coherent structures. Quart. Appl. Math. 45(3), 561–571 (1987)

    Google Scholar 

  10. Westhoff, A.: Spatial scaling of large-scale circulations and heat transport in turbulent mixed convection. PhD thesis, Georg-August University School of Science (GAUSS) (2012)

    Google Scholar 

  11. Westhoff, A., Bosbach, J., Schmeling, D., Wagner, C.: Experimental study of low-frequency oscillations and large-scale circulations in turbulent mixed convection. Int. J. Heat Fluid Flow 31(5), 794–804 (2010)

    Google Scholar 

  12. Westhoff, A., Grabinski, N., Bosbach, J., Wagner, C., Thess, A.: Scaling of turbulent mixed convection under high pressure. In: Fifth International Symposium on Turbulence and Shear Flow Phenomena, vol. 2, pp. 505–510 (2007)

    Google Scholar 

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Correspondence to Andreas Westhoff .

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Westhoff, A., Bosbach, J., Wagner, C. (2014). Large-scale Coherent Structures in Turbulent Mixed Convective Air Flow. In: Dillmann, A., Heller, G., Krämer, E., Kreplin, HP., Nitsche, W., Rist, U. (eds) New Results in Numerical and Experimental Fluid Mechanics IX. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-319-03158-3_29

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  • DOI: https://doi.org/10.1007/978-3-319-03158-3_29

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  • Print ISBN: 978-3-319-03157-6

  • Online ISBN: 978-3-319-03158-3

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