Heat Transfer Questions & Answers | |
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If you can't find the resistance, then list in your assumptions you assume no resistance.
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Any one is fine as long as the conditions are satisfied.
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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.
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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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$\pi$ |