“…They achieved significant improvements in heat transfer using different divergent nozzle turbulators with and without holes (triangular holes, square holes, and circle holes) (Akeel et al, 2014) . In order to examine the effect of turbulators on heat transfer in a horizontal pipe, Karagöz and his colleagues first installed fins in the pipe in order to create a turbulent flow and compared the unprocessed pipe to compare the data obtained.While performing these experimental operations, they used different turbulators with different vane distances and angles and carried out their studies in various reynolds numbers (Karagöz et al, 2017). In Kayataş and İlbaş studies, to examine the change of heat transfer, they installed fins of different geometries on a nested heat exchanger.…”