Based on simplified periodic model and RNG k-ε turbulence model

the flow characteristics and heat transfer properties of shell-side fluid in perforated-baffle heat exchangers were numerically simulated by using CFD software FLUENT. The feasibility and accuracy of numerical simulation method was verified by experiment. The heat transfer and resistance performance of trefoil-baffle

four-leaf-hole baffle

five-leaf-hole baffle

big-hole baffle and small-hole baffle are analyzed. Then the influences of structural parameters on heat transfer and resistance performance were discussed. Furthermore

heat transfer enhancement mechanism of perforated-baffle structure heat exchangers was investigated based on the field synergy principle. The results showed that the fluid flow in the shell-side of the perforated-baffle structure heat exchanger can be accurately simulated by using the RNG k-ε turbulence model and the simplified periodic model. The heat transfer coefficient of five-leaf-hole baffle is the best while the resistance the greatest. The heat transfer coefficient of the small-hole baffle is the worst

while the resistance is the least. The heat transfer coefficient and pressure drop decrease when baffle pitch and hole-height increase. Behind the support plate

the angle between the velocity vector and the temperature gradient varies violently

which enhances the heat transfer in the shell-side. The field synergy angle of five-leaf-hole baffle has the largest fluctuation range

and the enhancement of heat transfer effect is the best.