A detailed analysis of flow and heat transfer characteristics under a turbulent intermittent jet impingement on a concave surface

Ali Hajimohammadi, Mehran Rajabi Zargarabadi*, Javad Mohammadpour

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
13 Downloads (Pure)

Abstract

A computational study is carried out of the 3-D flow field and heat transfer under a turbulent intermittent circular jet impingement on a concave surface. The con-trol-volume procedure with the SIMPLE algorithm is employed to solve the un-steady RANS (use full form) equations. The RNG k-ε model is implemented to simulate turbulence due to its success in predicting similar flows. The numerical results are validated by comparing them with the experimental data. The effects of jet Reynolds number and oscillation frequency on the flow and heat transfer are evaluated. The profiles of instantaneous and time-averaged Nusselt numbers exhibit different trends in axial, x-directions and circumferential, s-directions. It is found that increasing frequency from 50 to 200 Hz results in considerable time-averaged Nusselt number enhancement in both axial and curvature direc-tions. The intermittent jet at a frequency of 200 Hz enhances the total average Nusselt number by 51.4%, 40%, and 33.7% compared to the steady jet values at jet Reynolds numbers of 10000, 23000, and 40000, respectively. In addition, a correlation for the average Nusselt number is proposed depending on the Reyn-olds number and the Strouhal number

Original languageEnglish
Pages (from-to)1709-1720
Number of pages12
JournalThermal Science
Volume26
Issue number2 Part C
DOIs
Publication statusPublished - 2022

Bibliographical note

Copyright the Publisher 2022. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • pulsating impinging jet
  • heat transfer
  • intermittent jet
  • concave surface
  • Nusselt number
  • Strouhal number

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