Fluid

d_p

ρ_f

μ_f

Geldart (1973) (Equation (1))

1

-

-

Abrahamsen and Geldart (1980) (Equation (2))

1

0.06

0.347

Kuwagi et al. (2014) (Equation (3))

0.836

0.165

0.224

Kogane et al. (2019) (Equation (4))

0.5

-

-