WOLFRAM SYSTEMMODELER

WallFriction

Different variants for pressure drops due to pipe wall friction

Package Contents

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)

TestWallFrictionAndGravity

Pressure loss in pipe due to wall friction and gravity (only for test purposes; if needed use Pipes.StaticPipe instead)

Information

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,D)*(L/D)*ρ*v*|v|/2

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

PipeFriction1.png

Wolfram Language

In[1]:=
SystemModel["Modelica.Fluid.Pipes.BaseClasses.WallFriction"]
Out[1]:=