Heat Transfer Questions & Answers  


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!




There is no problem with the question formulation.




This is valid only for laminar flow.




In this correlation, $x$ is the distance from where the boundary layer starts.




Well, by using a Nusselt number correlation that is suited to the turbulent/laminar regimes.




If you can't find a correlation that fit perfectly your situation, then choose the one that is the closest.




Yes, exactly. I mentioned this in class.



$\pi$ 