Heat Transfer Questions & Answers  


If you really want to know, you can try this in the quiz or exams and find out how many points you will lose.




If you can't find the resistance, then list in your assumptions you assume no resistance.




Any one is fine as long as the conditions are satisfied.




Well, as is written, one can be applied to either smooth and rough tubes, while the other can only be applied to rough tubes. Explain better what you don't understand.




No, you have to follow the instructions associated with the correlation. If it's specified the properties need to be determined at the average bulk temperature, then you need to do so.




Whether there are eddies or not has nothing to do with surface roughness. You can have lots of eddies (turbulence) in a tube with perfectly smooth walls.




As long as all the conditions specified are met, you can use any correlation you wish.




Right, both answers for A8Q1 were not for this problem. I fixed them: check again.




The friction factor mentioned in the “hint” is valid for both laminar or turbulent flows.




For a gas, you don't need to assume constant density but you need to assume negligible kinetic energy change. I think I mentioned this in class..




Yes, this sounds correct.




I don't understand what you write. What is $L_u$ and $L_t$? How do you calculate this? You need to define these new terms and explain how you got them.




You're on the right track!



$\pi$ 