Heat Transfer Questions & Answers  




I'm not sure why you want to correct it this way... You need to explain better what your idea is, because I can not understand.




Well, how can the crosssectional area be a circle of radius $S_n$? this doesn't make sense.. We are dealing with a tube bank where $S_n$ is a spacing between the tubes, and not a radius of anything. 0.5 point bonus boost.




No, be careful here. When deriving $\dot{m}(c_{p2}T_{b2}c_{p1}T_{b1})=q_{\rm w}$, we did not assume that the flow is fully developed. Thus the equation $\dot{m}(c_{p2}T_{b2}c_{p1}T_{b1})=q_{\rm w}$ can be applied for any internal flow either fully developed or not. 1 point bonus boost.




You are right that there was a mistake. But it is not in the answer but in the question formulation: it should be 6 rows deep, not 10 rows deep. I fixed the mistake in the assignment: please check the latest version. 2 points bonus.



$\pi$ 