[chinna]

Hai, Im simulating heat exchanger as the hot fluid in the tube and the cold fluid in shell. At first i close the flow path with caps and fill them in Geometry stage and suppress the caps. When i reach Fluent setup, it requires 3 walls setups,
1- tube which is internal fluid wall
2-external fluid, 1 for the outer wall and 1 for the inner wall which in shape of tube.
I tried setup the both walls (tube and external fluid inner wall) as shell conduction by dividing the thickness of the tube i wanted to simulate. Fluent solve it, however I think there is error in my results because of the setup. Can anyone please help me...?? is there anyways to combine the walls or any other ways to simulate this...???