Nusselt Number for Flat Plate: Laminar vs Turbulent

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mrblanco
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The Nusselt number for an entire flat plate in the turbulent region has two different equations: One for Turbulent and one for Combined Laminar and Turbulent. How do I know when to use one or the other?
 
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Those empirical relations generally have a range of Reynolds number in which they are valid. It's likely they are different.
 

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