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MapleSim Hydraulics Library from Modelon

Bend Edge  Basic model for bend edge geometry

The Bend Edge component calculates the pressure loss for flow through a circular cross-sectional area undergoing an edged bend with sharp corners. 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

mflowA=Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_edgedOverall_MFLOWIN_con=IN_con,IN_var=IN_var,Δp=Δp

pAabs=pA+patmoil

pAlimited=maxpA,pvapouroilpatmoil

pBabs=pB+patmoil

pBlimited=maxpB,pvapouroilpatmoil

mflowA+mflowB=0

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

η

[2]

Pas

Upstream dynamic viscosity

eta

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

[2] Modelica.Media.Air.MoistAir.Utilities.spliceFunctionx=Δp,pos=oil.dynamicViscosityp=pAabs,T=T,vair=oil.vgas,psat=psat,neg=oil.dynamicViscosityp=pBabs,T=T,vair=oil.vgas,psat=psat,Δx=100

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

Hydraulic Resistance Parameters

Name

Default

Units

Description

Modelica ID

dhyd

0.01

m

Hydraulic diameter

d_hyd

Δ

[1]

rad

Angle of turning

delta

K

0

m

Roughness (absolute average height of surface asperities)

K

[1] 12π

See Also

HydraulicResistance

MapleSim Hydraulics Library from Modelon Overview

 


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