CHT in a steel pipe- best way to start
 

Happy new year to all of you!
during this free time i would like to model this simple problem:
i have a straight steel pipe (diameter 900mm 100m long) with hot air (650 °c) going inside at 8m/s. around this pipe it's atmosphere at 20°C were there is convection.
i would like to find the temperature T(z) along the pipe.
what best tutorial example i should adapt?
thank for helping ...
Laurent