Investigation of heat transfer and pressure drop characteristics in a horizontal channel equipped with wavy triangular elements

In this thesis study, the turbulent forced heat transfer and pressure drop characteristics of a horizontal channel in which wavy triangular interior elements are placed in tandem arrangement are experimentally investigated. In all cases in the study, experiments were carried out under steady-state conditions and constant heat flux boundary conditions. Air was used as the working fluid, and constant thermophysical properties were considered. The effects of the side lengths (B=15 mm, 20 mm and 25 mm) of the triangular elements in single and double placement cases, the gap ratio between the triangles (W/B=2, 3 and 4) in the double arrangement and the radius of curvature on the surfaces of the triangular elements (R=2 mm and 4 mm) on heat transfer and pressure drop were investigated at different Reynolds numbers. The results are presented in terms of surface temperatures, average heat transfer coefficient, average Nusselt number, friction factor and pressure drop. It has been observed that as the edge length increases in single and double arrangement, the heat transfer and similarly the pressure drop increase. In dual arrangements, on the other hand, as the gap ratio between the elements increases, the heat transfer also increases. It has been observed that the increase in the radius of curvature of the waves on the surface of the triangular elements leads to a slight decrease in the heat transfer. The highest heat transfer is achieved in the case of B=25 mm, R=2 mm and Re=15.000 in single placement, B=25 mm, W/B=4, R=2 mm and Re=15.000 in double placement.