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Temperature Oscillations in Turbulent Mixed Convective Air Flows

  • D. SchmelingEmail author
  • J. Bosbach
  • Claus Wagner
Conference paper
  • 1k Downloads
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 125)

Abstract

We report on measurements of temperature oscillations observed in turbulent mixed convection in a rectangular enclosure. They are correlated to fluctuations and spontaneous reorientations of the large-scale circulations in the flow. Stable temperature configurations, periodic reconfigurations as well as spontaneous reversals and reorientations were detected. We ascribe the observed dynamics of the large-scale flow to the interaction between the superimposed shear forces of the forced convective flow and the buoyancy driven flow. Comparison with smoke visualisations allowed to assign the observed temperature distributions to a certain number and configuration of convection rolls. A frequency analysis of the oscillations as a function of the characteristic numbers is conducted revealing a sophisticated dependency of the dynamics of the large-scale flow on Ar, Re or Ra.

Keywords

Rayleigh Number Large Eddy Simulation Mixed Convection Characteristic Number Temperature Oscillation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.German Aerospace Center (DLR), Institute of Aerodynamics and Flow TechnologyGöttingenGermany

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