Numerical analysis of jet impingement heat transfer at high jet Reynolds number and large temperature difference

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Abstract

Jet impingement heat transfer from a round gas jet to a flat wall was investigated numerically for a ratio of 2 between the jet inlet to wall distance and the jet inlet diameter. The influence of turbulence intensity at the jet inlet and choice of turbulence model on the wall heat transfer was investigated at a jet Reynolds number of 1.66 × 105 and a temperature difference between jet inlet and wall of 1600 K. The focus was on the convective heat transfer contribution as thermal radiation was not included in the investigation. A considerable influence of the turbulence intensity at the jet inlet was observed in the stagnation region, where the wall heat flux increased by a factor of almost 3 when increasing the turbulence intensity from 1.5% to 10%. The choice of turbulence model also influenced the heat transfer predictions significantly, especially in the stagnation region, where differences of up to about 100% were observed. Furthermore, the variation in stagnation point heat transfer was examined for jet Reynolds numbers in the range from 1.10 × 105 to 6.64 × 105. Based on the investigations, a correlation is suggested between the stagnation point Nusselt number, the jet Reynolds number, and the turbulence intensity at the jet inlet for impinging jet flows at high jet Reynolds numbers. Copyright © 2013 Taylor and Francis Group, LLC.
Original languageEnglish
JournalHeat Transfer Engineering
Volume34
Issue number10
Pages (from-to)801-809
ISSN0145-7632
DOIs
Publication statusPublished - 2013

Bibliographical note

This work was financially supported by MAN Diesel & Turbo SE and the Danish Center for Applied Mathematics and Mechanics (DCAMM)

Keywords

  • Heat flux
  • Jets
  • Numerical analysis
  • Nusselt number
  • Reynolds number
  • Turbulence models
  • Inlet flow
  • Convective heat transfer
  • Gas jet
  • Heat transfer predictions
  • Impinging jet flow
  • Jet impingement
  • Jet inlets
  • Stagnation points
  • Stagnation regions
  • Temperature differences
  • Turbulence intensity
  • Wall distances
  • Wall heat flux
  • Wall heat transfer

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