Heat Transfer Questions & Answers | |
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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.
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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.
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As long as all the conditions specified are met, you can use any correlation you wish.
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Right, both answers for A8Q1 were not for this problem. I fixed them: check again.
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The friction factor mentioned in the “hint” is valid for both laminar or turbulent flows.
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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..
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$\pi$ |