Laminar momentum and heat transfer in isosceles triangular ducts with variable thermophysical properties
Abstract
The effects of the geometry and thermophysical property variation of air on the momentum and heat transfer in isosceles triangular ducts with varying apex angles are investigated. A numerical solution based on momentum and energy equations was developed to study momentum and heat transfer, and it was applied to isosceles triangular ducts. The thermophysical properties, velocity and temperature profiles, wall stress and heat flux distributions, and the friction factor for the duct are analyzed. It is observed that the property variations cause the friction factor to be greater than unity for heating and less than unity for cooling, and the behavior of the Nusselt number ratio is opposite that of the friction factor. The data reveal, as regards the geometry effect, that the friction factor and Nusselt number ratio values decrease according to the order of circular, equilateral triangular, and square duct for heating, and the opposite for cooling.
 Publication:

25th AIAA Aerospace Sciences Meeting
 Pub Date:
 January 1987
 Bibcode:
 1987aiaa.meetR....I
 Keywords:

 Compressible Flow;
 Computational Fluid Dynamics;
 Duct Geometry;
 Flow Geometry;
 Laminar Heat Transfer;
 Thermophysical Properties;
 Friction Factor;
 Heat Exchangers;
 Triangles;
 Fluid Mechanics and Heat Transfer