Thermal optimization of internally finned tube with variable fin thickness

In this study, thermal optimization of a tube with internal fins whose thickness varies freely in the direction normal to fluid flow was performed using a model based on the volume averaging theory. In the case of a water-cooled system, the thermal resistance of the optimized finned tube with variable fin thickness was reduced by up to 12% compared to that of an optimized straight-finned tube. The extent of the reduction was found to depend on the pumping power and tube length, and the conditions of the pumping power and tube length under which the reduction is more than 10% were evaluated. Because of their improved thermal performance, finned tubes with variable fin thickness have potential for use in cooling equipment in various thermal systems. (C) 2016 Elsevier Ltd. All rights reserved.