Force exerted by the fluid on the solid surface of flow through an annulus

Input(s)

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

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

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

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

Output(s)

Fz: Force (Newton)

Formula(s)

$$ F z=\pi * R^{2} *\left(1-K^{2}\right) *(p o-p L) $$

Reference(s)

Wikipedia.org.