For internal forced convection in a fully developed turbulent pipe flow (Dittus-Boelter equation), the Nusselt number is:

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Mechanical Engineering QUESTION #2433

Question 1

\(Nu_D = 0.332 Re_D^{0.8} Pr^{0.4}\)
\(Nu_D = 0.023 Re_D^{0.8} Pr^n\) where \(n=0.4\) for heating and \(n=0.3\) for cooling✔️
\(Nu_D = 3.66\) (constant, for laminar flow)
\(Nu_D = 0.664 Re_D^{1/2} Pr^{1/3}\)

Correct Answer Explanation

The Dittus-Boelter equation for turbulent pipe flow: \(Nu_D=0.023Re_D^{0.8}Pr^n\) with \(n=0.4\) for heating and \(n=0.3\) for cooling.