2 research outputs found
Multimode heat transfer characteristics in airflow through a differentially heated rectangular duct
Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.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 surface thermal radiation from duct walls.
The duct periphery is differentially heated with known
temperature profiles imposed on the two opposite vertical
sidewalls and the other two walls treated as adiabatic. The air
enters 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 Nusselt number at duct wall
and the fluid flow patterns are critically examined to identify
thermal instabilities and the significance of wall surface
radiation effects on the overall heat transfer rates.cs201
Convective heat transfer in airflow through a duct with wall thermal radiation
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