Laminar natural convection heat transfer from isothermal spheres

H. Jia, G. Gogos

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

Steady-state natural convection over a sphere has been studied numerically. Heat transfer and drag coefficients for a wide range of Grashof numbers (101 ≤ Gr ≤ 108) and Prandlt numbers 0.72 and 7.0 have been obtained. A plume with a mushroom-shaped front forms above the sphere whose length and thickness decrease with increasing Gr. At high Gr (Gr ≥ 107 and Pr = 0.72), flow separation and an associated recirculation vortex exist in the wake of the sphere. The vortex size increases with Gr. The local Nusselt number along the sphere surface first decreases, reaches a minimum, and then increases steeply at the rear of the sphere.

Original languageEnglish (US)
Pages (from-to)1603-1615
Number of pages13
JournalInternational Journal of Heat and Mass Transfer
Volume39
Issue number8
DOIs
StatePublished - May 1996

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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