Abstract:
The study aimed to enhance the heat transport by improving the hydrodynamic structure of the system by changing and restructuring the duct’s internal geometry. Modern fins, of the shape ‘V’, have
been proposed with different dimensions, and they are periodically arranged over the duct surfaces.
The most important steps of this research are the change in the V-fin attack-angle (40°–80°), length
(Hb/2, 3Hb/4, Hb, 5Hb/4 and 3Hb/2), and separation length (Ds/2, 3Ds/4, Ds and 5Ds/4), as well as the
flow rate (6 × 103–3 × 104). The study yielded an optimum case for a 40-degree attack-angle, with
a factor of thermal enhancement of 2.163 for the highest value of Reynolds number. On the other
hand, improving the length of the V-fins or decreasing in the space between them, increases the flow
strength by enlarging the recycling cells, which reflects on the hydrodynamic behavior, and changes
the heat transfer. The presence of this new model offins also highlights a hydrothermal improvement
ranging between 1.196 and 23.779 percent compared to the previously indicated models, reflecting
the effectiveness of the new system of solar heat exchangers with air V-finned ducts.
