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Convective heat transfer in airflow through a duct with wall thermal radiation

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Open access
Authors
Chandratilleke, Tilak
Narayanaswamy, Ramesh
Wangdhamkoom, Panithan
Date
2010
Type
Conference Paper

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Chandratilleke, T. T. and Narayanaswamy, R. and Wangdhamkoom, P. 2010. Convective heat transfer in airflow through a duct with wall thermal radiation, in Nasser Khalili and Somasundaram Valliappan and Qing Li and Adrian Russell (ed), 9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics (WCCM/APCOM 2010), Jul 19 2010. Sydney: IOP Conference Series: Materials Science and Engineering.
Source Title
Proceedings of the 9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics (WCCM/APCOM 2010)
Source Conference
9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics (WCCM/APCOM 2010)
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Department of Mechanical Engineering
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Abstract

This paper presents a numerical investigation on airflow through a heated horizontal rectangular duct wherein the model considers the combined modes of natural and forced convection heat transfer and the thermal radiation from duct walls. The duct periphery is differentially heated with known temperature profiles imposed on the two opposite vertical sidewalls while the other two walls are treated as adiabatic. The air enters into the duct hydrodynamically fully developed and flows steadily under laminar conditions undergoing thermal development within the duct. Considering several temperature profiles on the two vertical sidewalls, the numerical simulation generates the heat transfer rates and associated fluid flow patterns in the duct for a range of airflow rates, duct aspect ratios and surface emissivity. The variation of local Nusselt number at duct walls and the fluid flow patterns are critically examined to identify thermal instabilities and the significance of wall thermal radiation effects on the overall heat transfer rates.