Confined impinging air jet at low Reynolds numbers

Baydar E.

EXPERIMENTAL THERMAL AND FLUID SCIENCE, vol.19, no.1, pp.27-33, 1999 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 1
  • Publication Date: 1999
  • Doi Number: 10.1016/s0894-1777(98)10044-4
  • Journal Name: EXPERIMENTAL THERMAL AND FLUID SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.27-33
  • Keywords: jet impingement, subatmospheric region, pressure coefficient, CONVECTIVE HEAT-TRANSFER, IMPINGEMENT, PREDICTION, ARRAY, WALL
  • Karadeniz Technical University Affiliated: Yes

Abstract

The flow field between two horizontal surfaces arising from jet issuing from the lower surface and impinging normally on the upper surface have been experimentally investigated for a single jet and double jet. The velocity and pressure distributions in the impingement region were obtained over a Reynolds number range of 300-10 000 and a nozzle-to-plate spacing range of 0.5-4. The effects of Reynolds number and nozzle-to-plate spacing on the flow structure are reported. It is concluded that a subatmospheric region occurs on the impingement plate at nozzle-to-plate spacings up to two for Reynolds numbers greater than 2700 and that there exists a linkage between the subatmospheric region and the peaks in heat transfer coefficients. (C) 1999 Elsevier Science Inc. All rights reserved.