This component models pressure losses in a pipe due to friction. It also models delayed flow and handles height difference H between the start and end of the pipe.

It should be used when the pipe is so long that the resistance in the line has to be accounted for. For short lines when the friction losses can be neglected, it is enough to connect the ports to each other without using this model.

Implementation

Compressibility and flow delay is approximated by dividing the pipe into n segments and adding n-1 volumes between them. The pressure-flow equation used in each segment is shown below:



where

		:	Mass flow rate
		:	Fluid density
D		:	Inner pipe diameter
		:	Pressure difference between ports a and b
g		:	Standard acceleration of gravity on Earth
H		:	Height difference between ports a and b
		:	Kinematic viscosity of the fluid
L		:	Pipe length

Limitations

This class models steady, incompressible, laminar flow through a pipe. It is only valid for laminar flow, i.e. for Reynolds numbers below 2000.

References

• F. Young, R. Munson, H. Okiishi, and W. Huebsch, A Brief Introduction to Fluid Mechanics, 4th ed., Hoboken, NJ: Wiley, 2007 p. 284 and 291.
• C. Nordling and J. Österman, Physics Handbook for Science and Engineering, 7th ed., Lund, Sweden: Studentlitteratur, 2004 p. 183.

medium	Value: Oil() Type: Medium Description: Medium in the component
n	Value: 10 Type: Integer Description: Number of segments
D	Value: 0.01 Type: Diameter (m) Description: Inner pipe diameter
L	Value: 1 Type: Length (m) Description: Pipe length
H	Value: 1 Type: Length (m) Description: Height for point B minus height for point A
pLow	Value: 500000.0 Type: Pressure (Pa)
pHigh	Value: 10000000.0 Type: Pressure (Pa)
mdotLow	Value: 1e-005 Type: MassFlowRate (kg/s)
mdotHigh	Value: 1 Type: MassFlowRate (kg/s)