An experimental and numerical investicration on a confined impinging air jet at high Reynolds numbers

Baydar E., OZMEN Y.

APPLIED THERMAL ENGINEERING, cilt.25, ss.409-421, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.applthermaleng.2004.05.016
  • Dergi Adı: APPLIED THERMAL ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.409-421
  • Anahtar Kelimeler: jet impingement, subatmospheric region, pressure coefficient, turbulence, k-epsilon model, TURBULENCE MODEL ASSESSMENT, HEAT-TRANSFER, FLOW-FIELD, CIRCULAR JET, CROSS-FLOW, FLAT-PLATE, SLOT JETS, IMPINGEMENT, PLANE, PREDICTIONS
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

An experimental and numerical study is carried out to investigate flow field of a confined jet issuing from the lower surface and impinging normally on the upper surface. The mean velocity, turbulence intensity and pressure distributions in the impingement re-ion were obtained for Reynolds numbers ranging from 30,000 to 50,000 and a nozzle-to-plate spacing range of 0.2-6. The effects of Reynolds number and nozzle-to-plate spacing on the flow structure are examined. A subatmospheric region occurs on the Impingement plate at nozzle-to-plate spacings up to 2 for Reynolds numbers studied and it moves radially outward from the stagnation point with increasing nozzle-to-plate spacing. It is concluded that there exists a linkage among the subatmospheric region, turbulence intensity and heat transfer coefficients. The numerical results obtained using the standard k-epsilon turbulence model are in agreement with the experimental results except for the nozzle-to-plate spacings less than one. (C) 2004 Elsevier Ltd. All rights reserved.