WOLFRAM SYSTEM MODELER

VariableLaminarThrottle

Laminar restriction using conductance

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Valves.FlowControl.VariableLaminarThrottle"]
Out[1]:=

Information

This model with lumped volumes describes laminar flow. The conductance is controlled by the normalized signal sNorm, which varies between 0 and 1. The flow is given by the equation:



where
:Mass flow rate
:Fluid density
G:Conductance of the restriction
:Pressure difference between ports a and b

Limitations

This model is only valid for laminar flow. No checks are made if it is physically possible that the flow through the component actually is laminar.

Reference

F. Young, R. Munson, H. Okiishi, and W. Huebsch, A Brief Introduction to Fluid Mechanics, 4th ed., Hoboken, NJ: Wiley, 2007 p. 291.

Parameters (4)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

GMin

Value: 1e-020

Type: ConductanceOfLaminarResistance (m³/(s⋅Pa))

Description: Minimum conductance of laminar resistance

GMax

Value: 1e-010

Type: ConductanceOfLaminarResistance (m³/(s⋅Pa))

Description: Maximum conductance of laminar resistance

V

Value: 0.0001

Type: Volume (m³)

Description: Volume of component

Connectors (3)

port_b

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

port_a

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

sNorm

Type: RealInput

Description: Normalized position, between 0 and 1

Components (4)

medium

Type: Medium

Description: Medium in the component

volume_a

Type: Volume

Description: Fixed volume with fluid storage

volume_b

Type: Volume

Description: Fixed volume with fluid storage

controlledLaminarRestriction

Type: ControlledLaminarRestriction

Description: Laminar restriction using conductance