MapleSim Hydraulics Library from Modelon - MapleSim Help

Online Help

All Products    Maple    MapleSim


Home : Support : Online Help : MapleSim Toolboxes : MapleSim Hydraulics Library from Modelon : Hydraulic Resistance : ModelonHydraulics/HydraulicResistance/Channel

MapleSim Hydraulics Library from Modelon

Channel  Model for channel geometry

The Channel component calculates the pressure loss for flow through different geometries. The component takes into consideration surface roughness.

 

Equations

Variables

Connections

Parameters

Equations

ν=Modelica.Media.Air.MoistAir.Utilities.spliceFunctionx=Δp,pos=νoilp=pAabs,T=T,vair=vgasoil,psat=psat,neg=νoilp=pBabs,T=T,vair=vgasoil,psat=psat,Δx=100

ρ=Modelica.Media.Air.MoistAir.Utilities.spliceFunctionx=Δp,pos=ρoilp=pAabs,T=T,vair=vgasoil,psat=psat,neg=ρoilp=pBabs,T=T,vair=vgasoil,psat=psat,Δx=100

T=T0oil+ΔTsystem

q=mflowAρ

Δp=pAlimitedpBlimited

pAabs=pA+patmoil

pAlimited=maxpA,pvapouroilpatmoil

pBabs=pB+patmoil

pBlimited=maxpB,pvapouroilpatmoil

Variables

Name

Value

Units

Description

Modelica ID

Δp

 

Pa

Pressure drop

dp

q

 

m3s

Flow rate flowing into port_A

q

pAlimited

 

Pa

Limited gauge pressure

pA_limited

pBlimited

 

Pa

Limited gauge pressure

pB_limited

ρ

 

kgm3

Upstream density

rho

ν

 

m2s

Upstream kinematic viscosity

nu

pAabs

 

Pa

Absolute pressure pA

pA_abs

pBabs

 

Pa

Absolute pressure pB

pB_abs

T

 

K

Local temperature

T

pAsummary

pA

Pa

Pressure at port A

summary_pA

pBsummary

pB

Pa

Pressure at port B

summary_pB

Δpsummary

Δp

Pa

Pressure drop

summary_dp

qsummary

q

m3s

Flow rate flowing into port_A

summary_q

Phydsummary

Δpq

W

Hydraulic Power

summary_HP

psat

[1]

Pa

Gas saturation pressure

p_sat

VA

 

 

 

VolumeA

VB

 

 

 

VolumeB

channel

 

 

 

channel

[1] oil.gasSaturationPressureT=T,vgas=oil.vgas

Connections

Name

Description

Modelica ID

portA

Layout of port where oil flows into an element (0<mflow, pB<pA means 0<&Delta;p)

port_A

portB

Hydraulic port where oil leaves the component (mflow<0, pB<pA means 0<&Delta;p)

port_B

oil

 

oil

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

use volume A

true

 

If true, a volume is present at port_A

useVolumeA

use volume B

true

 

If true, a volume is present at port_B

useVolumeB

VA

10-6

m3

Geometric volume at port A

volumeA

VB

10-6

m3

Geometric volume at port B

volumeB

Hydraulic Resistance Parameters

Name

Default

Units

Description

Modelica ID

geometry

[1]

 

Choice of geometry for internal flow

geometry

L

1

m

Length

L

K

0

m

Roughness (average height of surface asperities)

K

dann

dcir

m

Small diameter

d_ann

Dann

2dann

m

Large diameter

D_ann

dcir

0.01

m

Internal diameter

d_cir

aell

34dcir

m

Half length of long base line

a_ell

bell

12aell

m

Half length of short base line

b_ell

arec

dcir

m

Horizontal length

a_rec

brec

arec

m

Vertical length

b_rec

atri

dcir1&plus;2

m

Length of base line

a_tri

htri

12atri

m

Height to top angle perpendicular to base line

h_tri

β

[2]

rad

Top angle

beta

[1] Modelica.Fluid.Dissipation.Utilities.Types.GeometryOfInternalFlow.Circular

[2] 12π

See Also

HydraulicResistance

MapleSim Hydraulics Library from Modelon Overview

 


Download Help Document

Was this information helpful?



Please add your Comment (Optional)
E-mail Address (Optional)
What is ? This question helps us to combat spam