Heat transfer
 

hi guys..

The problem is air is flowing in a tank, and the tank is heated externally with heaters.
I have to model the temperature change of air..my geometry is basically just a tank with an inlet and an outlet
first i tried to run the problem with a constant heat flux into the wall, and i got a huge temperature rise, which is wrong. then i added convection coefficient, which gave me almost no rise in air temperature..which again is wrong..
any suggestions on how i should proceed?
thanks!