L/DH > 0.03Re
L/DH < 0.03Re
Gz < 10
Gz > 10
Gz < 100
Gz > 100
Nu
3.66
1.6 (Gz)1/3
3.66 + 0.0668 ∗ G z 1 + 0.04 ∗ ( G z ) 2 3
1.6 ∗ ( G z ) 1 3