ISSN Online: 2377-424X
ISBN Print: 1-56032-797-9
International Heat Transfer Conference 11
EFFECTS OF VELOCITY, THERMAL CONDUCTANCE AND TUBE SHAPE ON THE PERFORMANCE OF FINNED TUBES
Abstrakt
Steady-state fluid flow and heat transport in solid and fluid of the first row of air-cooled extended finned tubes have been calculated numerically with the aid of finite element procedures by solving the conservation equations (heat, mass, momentum) under laminar conditions. Flow visualizations have been performed to analyze the local heat transfer. Measurements of integral pressure loss have been conducted depending on Reynolds number (Re) and geometry. Flow velocity, tube shape, fin spacing and thermal conductance have been varied to enhance heat flux and reduce pressure loss. Remarkable performance has been achieved with novel tubes. The results illustrate the essential significance of geometry and thermal conductance for high Re as well as the importance of fin spacing for low Re.