Based on a shell-side periodic unit channel model

twisted-leaf tube bundle Based on a shellside periodic unit channel model;twistedleaf tube bundle support was investigated as a new type of heat transfer enhancement element;and the turbulent flow and heat transfer characteristics were studied by numerical simulationThe RNG κ-ε twoequation turbulent model was used in the studyThe coupling between pressure and velocity was solved by SIMPLEC algorithm;and the enhanced wall treatment was adopted to solve the nearwall flow and heat transferThe periodic distributions of velocity and turbulent intensity on the cross sections along the main stream were presented and the synergy between velocity and temperature fields was analyzedThe local average Nusselt number on the cross section was compared with the local synergy angleIt was found that twistedleaf support produced the 3dimension helical motion which resulted in the disruption of the continuity and stability of the fluidThe disturbing flow could promote turbulent intensity and enhance heat transfer effectivelyMeanwhile;the swirl flow changed the distributions of velocity and temperature fields;and the fundamental mechanism of heat transfer enhancement by twistedleaf was the improvement of synergy between both fields..