bulk temperature
hi friends ,
I wish you good moments must polt the nusselt number in a circular tube under the condition that : constant flux and constant wall temperature we know the nusselt number after the developed region undert this conditions are 4.36 and 3.66 but my nusselt number is very large ! I think my problem is the bulk temperature ! but I don't know how can I correcte this problem , help me please step by step if you konw , I need the plot af nusselt number that leading to 4.36 and 3.66 thank you dears , in fluent software 
I have same problem,please help us:(

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Could you manage to solve the problem?! If not, I have some hints for you! Bests. 
you should use udf for bulk temperature,as u must be knowing that bulk temperature is integration of u(r)T(r)rdr /integration of u(r)rdr...where u is avg.velocity T is temperature and r is radius of ur pipe and limit is from 0toR

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