The double notched(DN) type corrugated plate heat transfer element is commonly used in rotary air preheaters. To reveal the micro-flow morphology and strengthening heat transfer mechanism in the corrugated channel of the DN plate

the LBKE(Lam and Bremhorst k-ε model) turbulence model and CFD numerical simulation technology are applied to investigate the heat transfer and flow resistance characteristics of the DN plate

including predicting the heat transfer and flow resistance coefficient

and analyzing the flow field and temperature field inside the channel of the DN plate. The results show that

two types of flow are observed in the predicted velocity fields

wavy channel flow and pipe flow. The Nusselt number Nu in upwind surface of the DN plate is larger while that at the leeward side is lower. As the Reynolds number Re increases

the Nu increases and its distribution on the DN plate becomes more uniform. Increasing the proportion of the corrugated structure can enhance the heat transfer capacity of the DN plate

but will also increase the resistance loss simultaneously. It suggests that the DN plate operate at moderate Re values(≈5 000)

to obtain the best effect and ensure the uniform distribution of Nu and control the resistance loss.