Knudsen gas
Encyclopedia
A Knudsen gas is a model for gas
es where particle collisions are ignored, as opposed to the Lorenz gas
where collisions are considered. In these gases the mean free path of molecules is bigger than the receptacle where the gas is contained. 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.
Gas
Gas is one of the three classical states of matter . Near absolute zero, a substance exists as a solid. As heat is added to this substance it melts into a liquid at its melting point , boils into a gas at its boiling point, and if heated high enough would enter a plasma state in which the electrons...
es where particle collisions are ignored, as opposed to the Lorenz gas
Lorenz gas
A Lorentz gas is a model for gases where particle collisions are considered, as opposed to the Knudsen gas which ignores particle collisions....
where collisions are considered. In these gases the mean free path of molecules is bigger than the receptacle where the gas is contained. A flow of gas through a pipe is called Knudsen Flow
Knudsen flow
Knudsen flow describes the movement of fluids with a high Knudsen number, that is, where the characteristic dimension of the flow space is of the same or smaller order of magnitude as the mean free path.-Separation processes using Knudsen Flow:...
when it can be expressed as the difference of two independent flows, which enter the pipe through its different ends.