Which of the following statements concerning Nusselt number Nu is (are) true? [A] Nu indicates the relative importance of convection heat transfer to conduction heat transfer [B) For airflow over a...

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Extracted text: Which of the following statements concerning Nusselt number Nu is (are) true? [A] Nu indicates the relative importance of convection heat transfer to conduction heat transfer [B) For airflow over a flat plate, the local Nu is larger for constant surface heat flux than for constant surface temperature [C] For airflow over a flat plate with unheated starting length, the local Nu is higher than that without unheated starting length [D] For fully developed laminar flow in a tube, Nu = 3.66 for tube with constant surface temperature and Nu = 4.36 for tube with constant surface heat flux. a) A, B, and C; (b) B, C, and D; (c) A, C, and D; (d) All of above; (e) none of above a O b e