Laminar natural convection heat transfer from isothermal spheres

H. Jia, George Gogos

Research output: Contribution to journalArticle

59 Citations (Scopus)

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 - Jan 1 1996

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Natural convection
free convection
heat transfer
Heat transfer
Vortex flow
vortices
Grashof number
flow separation
drag coefficients
Flow separation
Drag coefficient
Nusselt number
heat transfer coefficients
wakes
Heat transfer coefficients
plumes

ASJC Scopus subject areas

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

Cite this

Laminar natural convection heat transfer from isothermal spheres. / Jia, H.; Gogos, George.

In: International Journal of Heat and Mass Transfer, Vol. 39, No. 8, 01.01.1996, p. 1603-1615.

Research output: Contribution to journalArticle

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