Analysis of turbulent flow and heat transfer in internally finned tubes and annuli

S. V. Patankar, M. Ivanović, E. M. Sparrow

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

The fully developed turbulent flow and heat transfer characteristics for tubes and annuli with longitudinal internal fins were analyzed via a mixing length model. The model takes account of the proximity of both the fin surfaces and the tube wall as well as of the gradients in the radial and circumferential directions. Application was made to air flows, and a single adjustable constant in the model was fixed by comparisons with experimental data for the friction factor and the circumferential-average Nusselt number for internally finned tubes. The local heat transfer coefficients exhibited a substantial variation along the fin height, with the smallest value (essentially zero) at the base and the largest value at the tip. Lesser and more gradual variations were exhibited by the local heat transfer coefficients on the wall of the tube or annulus. In general, the fins were found to be as effective a heat transfer surface as the wall (per unit area). Average Nusselt numbers and friction factors are presented for both the tube and the annulus.

Original languageEnglish (US)
Pages (from-to)29-37
Number of pages9
JournalJournal of Heat Transfer
Volume101
Issue number1
DOIs
StatePublished - Feb 1979

Fingerprint

annuli
turbulent flow
Turbulent flow
fins
heat transfer
Nusselt number
tubes
Heat transfer
Heat transfer coefficients
friction factor
Friction
heat transfer coefficients
Fins (heat exchange)
air flow
proximity
Air
gradients

Cite this

Analysis of turbulent flow and heat transfer in internally finned tubes and annuli. / Patankar, S. V.; Ivanović, M.; Sparrow, E. M.

In: Journal of Heat Transfer, Vol. 101, No. 1, 02.1979, p. 29-37.

Research output: Contribution to journalArticle

Patankar, S. V. ; Ivanović, M. ; Sparrow, E. M. / Analysis of turbulent flow and heat transfer in internally finned tubes and annuli. In: Journal of Heat Transfer. 1979 ; Vol. 101, No. 1. pp. 29-37.
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