In-line tube-bank heat exchangers: Arrays with various numbers of thermally participating tubes

John M Gorman, Ephraim M Sparrow, J. Ahn

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This investigation presents numerical results for both laminar and turbulent flow and heat transfer for an in-line tube bank ranging in size from 1 to 20 tube rows over a Reynolds number range of 100–1000. Both the longitudinal and transverse pitches were fixed at 1.5D. It was demonstrated that the most useful heat transfer results were expressible as a total-tube-bank-averaged Nusselt number value, which is in contradiction to other investigations. For sufficiently lengthy tube banks, the existence of a fully developed regime characterized by an axially unchanging array-average Nusselt number was identified. It was found that the highest array-average heat transfer coefficients occurred in the initial portion of the tube bank, also in contradiction with information conveyed in some of the literature. A special case in which only a single tube in the array was thermally active was investigated in deference to experiments conducted under that condition. The present results obtained by numerical simulation compared favorably to existing experimental data.

Original languageEnglish (US)
Pages (from-to)837-847
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Volume132
DOIs
StatePublished - Apr 1 2019

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heat exchangers
Nusselt number
Heat exchangers
tubes
Heat transfer
Laminar flow
Heat transfer coefficients
Turbulent flow
Reynolds number
Computer simulation
heat transfer
Experiments
heat transfer coefficients
laminar flow
turbulent flow
simulation

Keywords

  • Heat transfer
  • In-line tube bank
  • Nusselt number
  • Pressure drop
  • Tube bundle

Cite this

In-line tube-bank heat exchangers : Arrays with various numbers of thermally participating tubes. / Gorman, John M; Sparrow, Ephraim M; Ahn, J.

In: International Journal of Heat and Mass Transfer, Vol. 132, 01.04.2019, p. 837-847.

Research output: Contribution to journalArticle

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abstract = "This investigation presents numerical results for both laminar and turbulent flow and heat transfer for an in-line tube bank ranging in size from 1 to 20 tube rows over a Reynolds number range of 100–1000. Both the longitudinal and transverse pitches were fixed at 1.5D. It was demonstrated that the most useful heat transfer results were expressible as a total-tube-bank-averaged Nusselt number value, which is in contradiction to other investigations. For sufficiently lengthy tube banks, the existence of a fully developed regime characterized by an axially unchanging array-average Nusselt number was identified. It was found that the highest array-average heat transfer coefficients occurred in the initial portion of the tube bank, also in contradiction with information conveyed in some of the literature. A special case in which only a single tube in the array was thermally active was investigated in deference to experiments conducted under that condition. The present results obtained by numerical simulation compared favorably to existing experimental data.",
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AB - This investigation presents numerical results for both laminar and turbulent flow and heat transfer for an in-line tube bank ranging in size from 1 to 20 tube rows over a Reynolds number range of 100–1000. Both the longitudinal and transverse pitches were fixed at 1.5D. It was demonstrated that the most useful heat transfer results were expressible as a total-tube-bank-averaged Nusselt number value, which is in contradiction to other investigations. For sufficiently lengthy tube banks, the existence of a fully developed regime characterized by an axially unchanging array-average Nusselt number was identified. It was found that the highest array-average heat transfer coefficients occurred in the initial portion of the tube bank, also in contradiction with information conveyed in some of the literature. A special case in which only a single tube in the array was thermally active was investigated in deference to experiments conducted under that condition. The present results obtained by numerical simulation compared favorably to existing experimental data.

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