Thermal radiation characteristics of cylindrical enclosures

E. M. Sparrow, L. U. Albers, E. R.G. Eckert

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

Consideration is given to the radiant interchange within finite-length cylindrical holes, one end of which is open to the environment. The bounding surfaces of the hole are isothermal and radiate in a gray, diffuse manner. The problem is analyzed by applying radiant flux balances to infinitesimal elements of surface, and this gives rise to two simultaneous integral equations. The solutions to these provide such technically interesting results as the distributioti of the apparent emissivity and local heat flux along the bounding surfaces and, also, the over-all heat flux streaming from the hole. It is found, for example, that to achieve an apparent emissivity of 0.99, the minimum length of hole is 1.6, 2.6, or 4 diameters depending on whether the surface emissivity ε is 0.9, 0.75, or 0.5. The over-all heat loss results demonstrate the effect of the presence of pits and depressions in increasing the heat loss frotn a surface.

Original languageEnglish (US)
Pages (from-to)73-79
Number of pages7
JournalJournal of Heat Transfer
Volume84
Issue number1
DOIs
StatePublished - Jan 1 1962

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Heat radiation
thermal radiation
enclosure
Enclosures
emissivity
Heat losses
Heat flux
heat flux
heat
Interchanges
Integral equations
integral equations
Fluxes

Cite this

Thermal radiation characteristics of cylindrical enclosures. / Sparrow, E. M.; Albers, L. U.; Eckert, E. R.G.

In: Journal of Heat Transfer, Vol. 84, No. 1, 01.01.1962, p. 73-79.

Research output: Contribution to journalArticle

Sparrow, E. M. ; Albers, L. U. ; Eckert, E. R.G. / Thermal radiation characteristics of cylindrical enclosures. In: Journal of Heat Transfer. 1962 ; Vol. 84, No. 1. pp. 73-79.
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