Heat transfer of an air jet impinging on a rough surface

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 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) was used to supply 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. Target plate-surface temperatures were measured over a Reynolds number ranging from 9,625-38,500 based on flow rate through a 6.85mm diameter nozzle. The same 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 then versus nozzle exit-to-plate spacing, z/d, and their correlations were determined. The results indicate an increase of up to 6.0% of the average Nusselt number due to surface roughness. This increase although modest provides an encouraging incentive to further investigate the surface roughness as a parameter for promoting heat transfer.

Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Pages111-118
Number of pages8
Volume347
Publication statusPublished - 1997
Externally publishedYes

Fingerprint

Surface roughness
Heat transfer
Air
Nozzles
Nusselt number
Heat losses
Reynolds number
Aluminum
Flow rate
Radiation
Temperature

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

Beitelmal, A., Saad, M. A., & Patel, C. D. (1997). Heat transfer of an air jet impinging on a rough surface. In American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD (Vol. 347, pp. 111-118)

Heat transfer of an air jet impinging on a rough surface. / Beitelmal, Abdlmonem; Saad, Michel A.; Patel, Chandrakant D.

American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. Vol. 347 1997. p. 111-118.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Beitelmal, A, Saad, MA & Patel, CD 1997, Heat transfer of an air jet impinging on a rough surface. in American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. vol. 347, pp. 111-118.
Beitelmal A, Saad MA, Patel CD. Heat transfer of an air jet impinging on a rough surface. In American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. Vol. 347. 1997. p. 111-118
Beitelmal, Abdlmonem ; Saad, Michel A. ; Patel, Chandrakant D. / Heat transfer of an air jet impinging on a rough surface. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. Vol. 347 1997. pp. 111-118
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