Graham equation viscosity ratio

Input(s)

$\emptyset$ : Volume Fraction (dimensionless)

$\Psi$ : Stream Function (dimensionless)

$\boldsymbol{\mu}_{\boldsymbol{r}}$ : Graham Equation Viscosity Ratio (dimensionless)

\mu_{\mathrm{r}}=1+\frac{5}{2} * \emptyset+\frac{9}{4} *\left(\frac{1}{\Psi *(1+0.5 * \Psi) *(1+\Psi)^{2}}\right)

Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second ed.). John Wiley & Sons. Chapter: 1, Page: 33.