The effects of vortex characteristics on performance of coiled wire turbulators used for heat transfer augmentation

Kenan Yakut*, Bayram Sahin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)

Abstract

The augmentation of the heat transfer by inserting different type turbulators into the channels is the conventional passive enhancement method. The coiled wire is one of the common heat transfer enhancement devices. These turbulators generate almost-periodic vortices into the flow while increasing the heat transfer rate. In this study, the properties of these vortices (i.e. the vortex shedding frequency and amplitudes of the pressure fluctuations of the vortices), flow (vortex)-acoustic coupling and the relation between entropy generation and vortex characteristics were investigated experimentally. Strouhal-Re-Ns,a and Prms-Re-Ns,a variations were presented graphically. It was observed that as the pitch increases, the vortex shedding frequencies decrease and the maximum amplitudes of pressure fluctuation of vortices produced by coiled wire turbulators occur with small pitches. In addition, the effects of the turbulators on the heat transfer, friction factor and performance characteristics were investigated. The coiled wires were thermodynamically advantageous (Ns,a<1) up to 13,000 Reynolds number.

Original languageEnglish
Pages (from-to)2427-2438
Number of pages12
JournalApplied Thermal Engineering
Volume24
Issue number16
DOIs
Publication statusPublished - Nov 2004
Externally publishedYes

Keywords

  • Coiled wire
  • Flow-induced vibrations
  • Heat transfer enhancement
  • Performance analysis

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