Heat transfer enhancement for turbulent mixed convection in reciprocating channels by various rib installations

Shiang Wuu Perng, Horng-Wen Wu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper numerically studies how the rib-pitch, rib-land, and rib-blockage ratios affect the axisymmetric turbulent flow and heat transfer in a reciprocating circular ribbed channel. The pitch ratio (rib-pitch to rib-height ratio of 8, 11, and 22), land ratio (rib-width to rib-height ratio of 0.5, 1.0, and 2.0), and blockage ratio (rib height to channel diameter of 0.05, 0.1, and 0.2) of rib were changed with a constant Reynolds number (10,000) under various Grashof numbers (∼0-400,000,000) and pulsating numbers (0 and 4.64). The average time-mean Nusselt number in the circular ribbed channel is 94.44-184.65% greater than that in the smooth channel undergoing reciprocating motion. The combined effect between buoyancy, reciprocating force, and inlet fluid momentum enhances the heat transfer from the wall in the channel. The turbulent heat transfer from the wall is improved by increasing land and blockage ratios of ribs with decreasing rib-pitch ratio for the channel.

Original languageEnglish
Pages (from-to)95-114
Number of pages20
JournalJournal of Enhanced Heat Transfer
Volume20
Issue number2
DOIs
Publication statusPublished - 2013 Oct 7

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Mixed convection
installing
convection
heat transfer
Heat transfer
augmentation
Grashof number
Nusselt number
Buoyancy
Turbulent flow
Momentum
Reynolds number
turbulent heat transfer
Fluids
buoyancy
turbulent flow
momentum
fluids

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Heat transfer enhancement for turbulent mixed convection in reciprocating channels by various rib installations",
abstract = "This paper numerically studies how the rib-pitch, rib-land, and rib-blockage ratios affect the axisymmetric turbulent flow and heat transfer in a reciprocating circular ribbed channel. The pitch ratio (rib-pitch to rib-height ratio of 8, 11, and 22), land ratio (rib-width to rib-height ratio of 0.5, 1.0, and 2.0), and blockage ratio (rib height to channel diameter of 0.05, 0.1, and 0.2) of rib were changed with a constant Reynolds number (10,000) under various Grashof numbers (∼0-400,000,000) and pulsating numbers (0 and 4.64). The average time-mean Nusselt number in the circular ribbed channel is 94.44-184.65{\%} greater than that in the smooth channel undergoing reciprocating motion. The combined effect between buoyancy, reciprocating force, and inlet fluid momentum enhances the heat transfer from the wall in the channel. The turbulent heat transfer from the wall is improved by increasing land and blockage ratios of ribs with decreasing rib-pitch ratio for the channel.",
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Heat transfer enhancement for turbulent mixed convection in reciprocating channels by various rib installations. / Perng, Shiang Wuu; Wu, Horng-Wen.

In: Journal of Enhanced Heat Transfer, Vol. 20, No. 2, 07.10.2013, p. 95-114.

Research output: Contribution to journalArticle

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AB - This paper numerically studies how the rib-pitch, rib-land, and rib-blockage ratios affect the axisymmetric turbulent flow and heat transfer in a reciprocating circular ribbed channel. The pitch ratio (rib-pitch to rib-height ratio of 8, 11, and 22), land ratio (rib-width to rib-height ratio of 0.5, 1.0, and 2.0), and blockage ratio (rib height to channel diameter of 0.05, 0.1, and 0.2) of rib were changed with a constant Reynolds number (10,000) under various Grashof numbers (∼0-400,000,000) and pulsating numbers (0 and 4.64). The average time-mean Nusselt number in the circular ribbed channel is 94.44-184.65% greater than that in the smooth channel undergoing reciprocating motion. The combined effect between buoyancy, reciprocating force, and inlet fluid momentum enhances the heat transfer from the wall in the channel. The turbulent heat transfer from the wall is improved by increasing land and blockage ratios of ribs with decreasing rib-pitch ratio for the channel.

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