I am try to find heat absorbed by the tube as shown in the photo below. liquid at room temperature is flowing through the pipe and hot flue gases are passing around the tube. I am using conjugate heat flow as there are to fluids involved. But not getting enough heat flow to the tube.
Can any one please help me and tell me what am I doing wrong?
Please do inform me if this is the right way of doing heat flow study in this case.
If you have want to go through the study, Please let me know I can send you the model; not attaching the file as the zipped file exceeds the limit.