PartialWallFriction Partial wall friction characteristic (base package of all wall friction characteristics)
	NoFriction No pipe wall friction, no static head
	Laminar Pipe wall friction for laminar flow in circular tubes (linear correlation)
	QuadraticTurbulent Pipe wall friction for turbulent flow in circular tubes (simple characteristic, mu not used)
	LaminarAndQuadraticTurbulent Pipe wall friction for laminar and turbulent flow in circular tubes (simple characteristic)
	Detailed Pipe wall friction for laminar and turbulent flow (detailed characteristic)

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This package provides functions to compute pressure losses due to wall friction in a pipe. Every correlation is defined by a package that is derived by inheritance from the package WallFriction.PartialWallFriction. The details of the underlying pipe wall friction model are described in the UsersGuide. Basically, different variants of the equation

dp = λ(Re,Δ)*(L/D)*ρ*v*|v|/2

are used, where the friction loss factor λ is shown in the next figure: