[Happy11]

Hi

I want to simulate a flow which is fully developed to transfer heat within a pipe, which is defined as d((Tw-T)/Tw-Tb))/dx=0 in the flow direction, where Tw is the average wall temperature within the cross section, T is the local fluid temperature and Tb is the average tempearture of the fluid.

I decide to assign this boundary to 'outflow condition' or 'pressure-outlet condition'. Firstly, can you tell me which one is more suitable?

Secondly, how can I set this thermal boundary condition if I use either one of the above.

Thanks a lot