L/D_H > 0.03R_e

L/D_H < 0.03R_e

G_z < 10

G_z > 10

G_z < 100

G_z > 100

N_u

3.66

1.6 (G_z)^1/3

$3.66+\frac{0.0668\ast G_z}{1+0.04\ast {\left(G_z\right)}^{\frac{2}{3}}}$

$1.6\ast {\left(G_z\right)}^{\frac{1}{3}}$