The effect of inclination on the heat transfer between a flat surface and an impinging two-dimensional air jet

Abdlmonem Beitelmal, Michel A. Saad, Chandrakant D. Patel

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

An experimental study was performed to determine the effect of the inclination of an impinging two-dimensional air jet on the heat transfer from a uniformly heated flat plate. The impingement surface was a stainless steel plate of the same width as the jet nozzle. Local Nusselt numbers were determined as a function of three parameters: (a) inclination angle of the air jet relative to the plate in the range of 90-40°, (b) nozzle exit-to-plate spacing (z/D) in the range of 4-12 and (c) Reynolds number based on the hydraulic diameter of the slot nozzle in the range of 4000-12 000 (corresponding to an exit jet velocity from 6.3 to 18.7 m/s). The results are presented in the form of graphs showing the variation of the local Nusselt number as a function of these parameters. The region of maximum heat transfer shifts towards the uphill side of the plate and the maximum Nusselt number decreases as the inclination angle decreases. The location of the maximum heat transfer region appears to fall between 0 and 3D uphill from the geometrical impingement point, and was found to be insensitive to the Reynods number in the range used in this study. For low values of inclination angle, the local Nusselt number on the uphill side from the maximum heat transfer point was insensitive to jet exit-to-plate spacing. Correlations are proposed to predict the local Nusselt number as a function of x/D, z/D, 0 and Re. (C) 2000 Elsevier Science Inc. All rights reserved.

Original languageEnglish
Pages (from-to)156-163
Number of pages8
JournalInternational Journal of Heat and Fluid Flow
Volume21
Issue number2
DOIs
Publication statusPublished - 1 Apr 2000
Externally publishedYes

Fingerprint

air jets
Nusselt number
inclination
flat surfaces
heat transfer
Heat transfer
Air
Nozzles
impingement
nozzles
spacing
jet nozzles
Stainless Steel
flat plates
slots
hydraulics
stainless steels
Reynolds number
Stainless steel
Hydraulics

Keywords

  • Electronics cooling
  • Heat transfer
  • Impinging jet
  • Inclined jet
  • Jet cooling
  • Obliquely impinging jet

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

The effect of inclination on the heat transfer between a flat surface and an impinging two-dimensional air jet. / Beitelmal, Abdlmonem; Saad, Michel A.; Patel, Chandrakant D.

In: International Journal of Heat and Fluid Flow, Vol. 21, No. 2, 01.04.2000, p. 156-163.

Research output: Contribution to journalArticle

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