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Experimental study of the near wall region of a natural convection driven flow next to a vertical cylinder

  • Chalmers University of Technology

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

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 = gβΔTL4/αν ≈ 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.

Original languageEnglish
Title of host publicationProgress in Turbulence and Wind Energy IV - Proceedings of the iTi Conference in Turbulence 2010
EditorsAlessandro Talamelli, Joachim Peinke, Michael Holling, Martin Oberlack, Luciano Castillo
PublisherSpringer Science and Business Media, LLC
Pages287-291
Number of pages5
ISBN (Print)9783642289675
DOIs
StatePublished - 2012
Event4th Conference on Turbulence, iTi 2010 - Bertinoro, Italy
Duration: Sep 19 2010Sep 22 2010

Publication series

NameSpringer Proceedings in Physics
Volume141
ISSN (Print)0930-8989
ISSN (Electronic)1867-4941

Conference

Conference4th Conference on Turbulence, iTi 2010
Country/TerritoryItaly
CityBertinoro
Period09/19/1009/22/10

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