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Experimental Study of the Near Wall Region of a Natural Convection Driven Flow Next to a Vertical Cylinder

  • Abolfazl Shiri
  • William K. George
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 141)

Abstract

Temperature and velocity fields are measured in the boundary layer flow of air along a heated vertical cylinder using cold-wire thermometry, thermocouples and two-component laser Doppler anemometry. Detailed measurements are taken at three different heights, corresponding to Rayleigh numbers, ranging from Ra = ΔTL 4/ αv ≈ 1.0 ×1010 to Ra ≈ 1.7 ×1011. The highest of these showed clearly evidence of confinement by the containment cylinder. This paper focuses on measurements of the mean and turbulence quantities in the near wall region where the varying thermal properties also affect the flow due to the strong temperature gradient there. A new set of boundary layer equations are established to represent the variable properties of the flow in this region. This experimental investigation also reveals that the strong temperature gradients adversely affect both the steady and unsteady temperature results because of the conduction to the supports of the temperature probes.

Keywords

Boundary Layer Wall Shear Stress Natural Convection Rayleigh Number Wall Region 
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References

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    Tsuji, T., Nagano, Y.: Turbulence measurements in a natural convection boundary layer along a vertical flat plate. International Journal of Heat and Mass Transfer 31(10), 2101–2111 (1988)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Dept. of Shipping & Marine TechnologyChalmers Univ. of Tech.GothenburgSweden
  2. 2.Departments of Aeronautics and Mechanical EngineeringImperial College LondonLondonUK

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