Heat Transfer Questions & Answers  




Hmm, this is well beyond the scope of this course and may confuse others (especially those who haven't taken the course compressible flow yet). I am not sure if the Eckert number is larger or lower within the boundary layer over a blunt body or cone.. You need to find the flow properties after the shock and compute the Eckert number using such properties..




Yes, exactly. Indeed, recall the derivation of the Nusselt number: $$ \frac{\delta_t}{\delta} \propto {\rm Pr}^{1/3} $$ Thus, the larger the Prandtl number, the smaller $\delta_t$ is compared to $\delta$. 1 point bonus.




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I don't understand well your logic and how this recovery factor can be obtained from the stagnation temperature equation (you should have explained this fully). But anyway, you define $r$ as the ratio between temperature differences, so this is one physical meaning of it — I don't see any other possible physical interpretation..



$\pi$ 