To improve the heat exchange tube's comprehensive performance and achieve
enhanced heat transfer with lower flow resistance. The flow and heat
transfer characteristics of a newly enhanced tube with triangular ribs were
studied by numerical simulation. The results show that the multi-vortex
longitudinal swirl developed in the triangular rib enhanced tube can enhance
the cold and hot fluid mixing, and make the temperature distribution in the
tube more uniform. The field synergy of velocity and temperature gradient was
improved and the heat transfer capacity was enhanced. In the triangular rib
enhanced tube, reducing the dimensionless pitch ratio of triangular ribs
(P*=0.5, 0.75, 1, and 1.25) and appropriately increasing the area of
triangular ribs (A=8, 12, 16, and 20 mm2) can improve the performance
evaluation criteria (PEC). When Re=8475, P*=0.5, and A=20mm2, the maximum
PEC=1.324 is obtained.