Performance and flow-induced vibration characteristics for conical-ring turbulators

Kenan Yakut*, Bayram Sahin, Suat Canbazoglu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)


In the present study, the performance characteristics of the conical-ring turbulators are determined by means of the entropy- generation minimization method based on the second law and enhancement efficiency based on the first law of thermodynamics. The relations between these performance and flow-induced vibration characteristics have been examined. The maximum entropy generation, at the same Reynolds number, occurs in sequence by the conical rings with 10, 20 and 30 mm pitches, respectively. The conical rings are thermodynamically advantageous (Ns,a < 1) up to 8000 Reynolds number with respect to entropy generation. The enhancement efficiency increases as the pitch decreases and varies between 0.86 and 1.16. The turbulators with 20 and 30 mm pitch, especially, produce vortices having low amplitudes up to a Reynolds number of 12,000.

Original languageEnglish
Pages (from-to)65-76
Number of pages12
JournalApplied Energy
Issue number1
Publication statusPublished - Sept 2004
Externally publishedYes


  • Enhancement efficiency
  • Entropy-generation number
  • Flow-induced vibrations


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