Knudsen flow
Input(s)
m: Molecular Mass (g)
\(\mathrm{K}\): Boltzmann Constant \(\left(\mathrm{m}^{2} \mathrm{~kg} \mathrm{~s}^{-2} \mathrm{~K}^{-1}\right)\)
\(\mathrm{T}\): Temperature (Kelvin)
R: Radius (m)
po: Pressure at Initial point \((\mathrm{Pa})\)
pL: Pressure at point \(\mathrm{L}(\mathrm{Pa})\)
L: Length (m)
Output(s)
w: Mass Rate Flow \((\mathrm{kg} / \mathrm{s})\)
Formula(s)
\[
w=\operatorname{sqrt}\left(2 * \frac{m}{K * T}\right) *\left(\frac{4}{3} * R^{3}\right) * \frac{p o-p L}{L}
\]
Reference(s)
Wikipedia.org.