Numerical study of heat transfer by natural convection and surface thermal radiation in an open cavity receiver

Moises Montiel Gonzalez, Jesús Hinojosa Palafox*, Claudio A. Estrada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

In this work the numerical results of natural convection and surface thermal radiation in an open cavity receiver considering large temperature differences and variable fluid properties are presented. Numerical calculations were conducted for Rayleigh number (Ra) values in the range of 10 4-10 6. The temperature difference between the hot wall and the bulk fluid (ΔT) was varied between 100 and 400K, and was represented as a dimensionless temperature difference (φ) for the purpose of generalization of the trends observed. Noticeable differences are observed between the streamlines and temperature fields obtained for φ=1.333 (ΔT=400K) and φ=0.333 (ΔT=100K). The total average Nusselt number in the cavity increased by 79.8% (Ra=10 6) and 88.0% (Ra=10 4) as φ was varied from 0.333 to 1.333. Furthermore the results indicate that for large temperature differences (0.667≤φ≤1.333) the radiative heat transfer is more important that convective heat transfer.

Original languageEnglish
Pages (from-to)1118-1128
Number of pages11
JournalSolar Energy
Volume86
Issue number4
DOIs
StatePublished - Apr 2012

Keywords

  • Natural convection
  • Numerical heat transfer
  • Open cavity receiver
  • Surface thermal radiation

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