[Hamda]

Hi,
first of all It should be mentioned that I read the following link :
https://www.cfd-online.com/Wiki/Ansy...ficient_in_CFX


But it didn't help me on my problem. My problem is that I want to write an expression for htc as follows:
htc= Wall Heat Flux/(Ts-Tf)
where Ts is solid temperature and Tf is fluid temperature and I already drew charts for solid and fluid temperatures along the axial direction. But when I use the above expression for htc, I get error. Is there anybody who knows how can I solve my problem? since Ts and Tf change along the axial direction and I couldn't use constant temperature.
Many thanks in advance.