The equation was derived by Kozeny (1927)[1] and Carman (1937, 1956)[2][3][4] from a starting point of (a) modelling fluid flow in a packed bed as laminar fluid flow in a collection of curving passages/tubes crossing the packed bed and (b) Poiseuille's law describing laminar fluid flow in straight, circular section pipes.
The equation is given as:[4][5] where: This equation holds for flow through packed beds with particle Reynolds numbers up to approximately 1.0, after which point frequent shifting of flow channels in the bed causes considerable kinetic energy losses.
This equation is a particular case of Darcy's law, with a very specific permeability.
Darcy's law states that "flow is proportional to the pressure gradient and inversely proportional to the fluid viscosity" and is given as: Combining these equations gives the final Kozeny equation for absolute (single phase) permeability: where: The equation was first[8] proposed by Kozeny (1927)[1] and later modified by Carman (1937, 1956).
[2][3] A similar equation was derived independently by Fair and Hatch in 1933.