Compare the results obtained from Equations (6-17), (6-21), (6-22), and (6-23) for air at 1 atm and 300 K flowing across a cylinder maintained at 400 K, with Reynolds numbers of 50,000 and 100,000. What do you conclude from these results?
Equations (6-17)

Equations (6-21)

Equations (6-22)

Equations (6-23)

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rI Itoo Nudf Nud = 0.3 + 0.62 Re1/2pr1/3 Re 5/874/5 LI +(0.4/Pr)/282,000 for 10 Red <10: Ped 0.2 0.62 Re,2Pr1/3 1(0.4/Pr)2 Nud 0.3+ Red 1/2 for 20,000 Red 400.000; Ped 0.2 hd