Effects of surface roughness on the average heat transfer of an impinging air jet

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

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The effect of surface roughness of a uniformly heated plate on the average heat transfer characteristics of an impinging air jet was experimentally investigated. Two aluminum plates, one with a flat surface and the second with some roughness added to the surface were fabricated. The roughness took the shape of a circular array of protrusions of 0.5mm base and 0.5mm height. A circular Kapton heater of the same diameter as the plates (70mm) supplied the necessary power. The surfaces of the plates were polished to reduce radiation heat losses and the back and sides insulated to reduce conduction heat losses. Temperatures were measured over a Reynolds number ranging from 9600 to 38500 based on flow rate through a 6.85mm diameter nozzle. The temperature measurements were repeated for nozzle exit-to-plate spacing, z/d, ranging from 1 to 10. The average Nusselt number for both cases was plotted versus the Reynolds number and their functional correlation was determined. The results indicate an increase of up to 6.0% of the average Nusselt number due to surface roughness. This modest increase provides evidence to encourage further investigation and characterization of the surface roughness as a parameter for enhancing heat transfer. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalInternational Communications in Heat and Mass Transfer
Volume27
Issue number1
DOIs
Publication statusPublished - 1 Jan 2000
Externally publishedYes

Fingerprint

air jets
surface roughness
Surface roughness
heat transfer
Heat transfer
Air
Nusselt number
Heat losses
nozzles
Nozzles
Reynolds number
roughness
Kapton (trademark)
Aluminum
heaters
conductive heat transfer
Temperature measurement
temperature measurement
flat surfaces
flow velocity

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

Effects of surface roughness on the average heat transfer of an impinging air jet. / Beitelmal, Abdlmonem; Saad, Michel A.; Patel, Chandrakant D.

In: International Communications in Heat and Mass Transfer, Vol. 27, No. 1, 01.01.2000, p. 1-12.

Research output: Contribution to journalArticle

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