A flow of gas through a pipe is called Knudsen flow when it can be expressed as the difference of two independent flows, which enter the pipe through its different ends.
Scapa Flow | Mas Flow 2 | Mas Flow | Povl Riis-Knudsen | Nu Flow | Morrison-Knudsen | Flow network | Flow Country | flow | Volumetric flow rate | Stokes flow | Mas Flow: Los Benjamins | Lars Knudsen | Laminar flow | Hustle & Flow | Gunnar Knudsen | Flow My Firetear | Flow measurement | Even Flow | Energy flow | An Endress+Hausser electromagnetic flow meter | Where the Rivers Flow North | Tommy Knudsen | Sidse Babett Knudsen | Real Time Media Flow Protocol | Per Holm Knudsen | Mass flow sensor | laminar flow | Knudsen gas | Knudsen flow |