Nusselt number for flow through parallel plate under periodic boundary condition
 

Hi everyone,

I am simulating flow through parallel plates (2-D) with periodic boundary condition (in order to achieve fully developed condition throughout the channel). Both plates are maintained at Tw (hot temperature). When I use low Reynolds number, fluid achieves Tw throughout and subsequently heat transfer coefficient becomes zero (because del(T)/del(y)=0) at the wall but standard result shows higher Nusselt number (~8.0) for low Re flow. I am not getting Nu=7.54 for higher Reynolds number either. Can anyone guide me to solve this issue?

Thanks in advance. :)