Mass rate of flow through annulus

Input(s)

po: Pressure at initial point $(\mathrm{Pa})$

$\mathrm{pL}$: Pressure at point $\mathrm{L}(\mathrm{Pa})$

$\mathrm{R}$: Radius $(\mathrm{m})$

$\rho$: Density $\left(\mathrm{kg} / \mathrm{m}^{3}\right)$

$\mathrm{mu}$: Viscosity $(\mathrm{kg} /(\mathrm{ms}))$

L: Length $(\mathrm{m})$

$\mathrm{K}$: Boltzmann Constant $\left(\mathrm{m}^{2} \mathrm{~kg} \mathrm{~s}^{-2} \mathrm{~K}^{-1}\right)$

Output(s)

$\Psi$: Mass Rate of Flow $(\mathrm{kg} / \mathrm{s})$

Formula(s)

Reference(s)

Transport Phenomena, Second Edition, Bird, Chapter 2.