CFD Calculation of Internal Natural Convection in the Annulus between Horizontal Concentric Cylinders

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The objective of this heat transfer and fluid flow study is to assess the ability of a computational fluid dynamics (CFD) code to reproduce the experimental results, numerical simulation results, and heat transfer correlation equations developed in the literature for natural convection heat transfer within the annulus of horizontal concentric cylinders. In the literature, a variety of heat transfer expressions have been developed to compute average equivalent thermal conductivities. However, the expressions have been primarily developed for very small inner and outer cylinder radii and gap-widths. In this comparative study, interest is primarily focused on large gap widths (on the ... continued below

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45 pages

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N.D. Francis, Jr; Itamura, M.T.; Webb, S.W. & James, D.L. October 1, 2002.

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Description

The objective of this heat transfer and fluid flow study is to assess the ability of a computational fluid dynamics (CFD) code to reproduce the experimental results, numerical simulation results, and heat transfer correlation equations developed in the literature for natural convection heat transfer within the annulus of horizontal concentric cylinders. In the literature, a variety of heat transfer expressions have been developed to compute average equivalent thermal conductivities. However, the expressions have been primarily developed for very small inner and outer cylinder radii and gap-widths. In this comparative study, interest is primarily focused on large gap widths (on the order of half meter or greater) and large radius ratios. From the steady-state CFD analysis it is found that the concentric cylinder models for the larger geometries compare favorably to the results of the Kuehn and Goldstein correlations in the Rayleigh number range of about 10{sup 5} to 10{sup 8} (a range that encompasses the laminar to turbulent transition). For Rayleigh numbers greater than 10{sup 8}, both numerical simulations and experimental data (from the literature) are consistent and result in slightly lower equivalent thermal conductivities than those obtained from the Kuehn and Goldstein correlations.

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45 pages

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INIS; OSTI as DE00808039

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  • Other Information: PBD: 1 Oct 2002

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  • Report No.: SAND2002-3132
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/808039 | External Link
  • Office of Scientific & Technical Information Report Number: 808039
  • Archival Resource Key: ark:/67531/metadc735998

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 2002

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • March 24, 2016, 6 p.m.

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N.D. Francis, Jr; Itamura, M.T.; Webb, S.W. & James, D.L. CFD Calculation of Internal Natural Convection in the Annulus between Horizontal Concentric Cylinders, report, October 1, 2002; Las Vegas, Nevada. (digital.library.unt.edu/ark:/67531/metadc735998/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.