A NUMERICAL INVESTIGATION ON CONFINED IMPINGING ARRAY OF AIR JETS


ÖZMEN Y. , BAYDAR E.

ISI BILIMI VE TEKNIGI DERGISI-JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY, vol.33, no.2, pp.65-74, 2013 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 2
  • Publication Date: 2013
  • Title of Journal : ISI BILIMI VE TEKNIGI DERGISI-JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY
  • Page Numbers: pp.65-74

Abstract

The flow and heat transfer characteristics of two dimensional confined impinging array of air jets have been numerically investigated. Simulations have been carried out by using the Realizable k-epsilon and Standard k-omega turbulence models for Reynolds number of 30000, nozzles-to-plate spacing (H/D) in the range of 1-10 and jet-to-jet centerline spacing (S/D) in the range of 2-6. The effects of nozzle-to-plate spacing and jet-to-jet centerline spacing on the flow structure and heat transfer were examined. Calculated results show that the pressure coefficient and Nusselt number distributions of jet array impinging on a plate is strongly affected by the nozzle-to-plate spacing. On the other hand, the magnitudes of the local pressure coefficient and maximum Nusselt number at the central stagnation point is not affected by jet-to-jet spacing. When numerically obtained Nusselt number distributions compared with experimental data, it is seen that the Realizable k-epsilon turbulence model exhibits better agreement with the experimental data, compared to the Standard k-epsilon turbulence model for the investigated configurations.