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COMBINED FORCED CONVECTION AND SURFACE RADIATION IN CONCENTRIC ANNULI

DOI: 10.1615/ICHMT.2009.CONV.230
25 pages

Fahad G. Al-Amri
Mechanical Technical Department, College of Technology, Technical and Vocational Training Corporation, P. O. Box 7650, Dammam, 31472, Saudi Arabia

Maged A. I. El-Shaarawi
Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia

Résumé

The effects of surface radiation on the developing laminar forced convection flow of a transparent gas in concentric annuli are numerically investigated under the thermal conditions of inner wall is uniformly heated and the outer wall is adiabatic. To conduct this investigation, four shape factors not available in the literature (between a differential ring on the inner and outer surfaces of annulus and the annular opening at the inlet and the exit end of the annulus) have been derived and validated. The effect of radius ratio on thermal radiation interchange between the two walls of the annuli is presented and discussed. The effects of other controlling parameters on wall temperature and Nusslet number are illustrated. Finally, threshold values of the emissivity at which radiation effects can be neglected are obtained and presented.

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