Modelica.Fluid.Dissipation.PressureLoss.Channel

Information

Channel

Internal overall flow

Calculation of pressure loss for an internal flow through different geometries at laminar and turbulent flow regime considering surface roughness. See more information.

Package Content

Name	Description
dp_internalFlowOverall_DP	Pressure loss of internal flow | calculate pressure loss | overall flow regime | surface roughness | several geometries
dp_internalFlowOverall_MFLOW	Pressure loss of internal flow | calculate mass flow rate | overall flow regime | surface roughness | several geometries
dp_internalFlowOverall_IN_con	Input record for function dp_internalFlowOverall_DP and dp_internalFlowOverall_MFLOW
dp_internalFlowOverall_IN_var	Input record for function dp_internalFlowOverall_DP and dp_internalFlowOverall_MFLOW

Modelica.Fluid.Dissipation.PressureLoss.Channel.dp_internalFlowOverall_DP

Information

Calculation of pressure loss for an internal flow through different geometries at overall flow regime for incompressible and single-phase fluid flow considering surface roughness.

Generally this function is numerically best used for the incompressible case , where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated. On the other hand the function dp_internalFlowOverall_MFLOW is numerically best used for the compressible case if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated. See more information.

Inputs

Name	Description
Constant inputs
IN_con	Input record for function dp_internalFlowOverall_DP
Variable inputs
IN_var	Input record for function dp_internalFlowOverall_DP
Input
m_flow	Mass flow rate [kg/s]

Outputs

Name	Description
DP	Output for function dp_internalFlowOverall_DP [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Channel.dp_internalFlowOverall_MFLOW

Information

Calculation of pressure loss for an internal flow through different geometries at overall flow regime for incompressible and single-phase fluid flow considering surface roughness.

Generally this function is numerically best used for the compressible case if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated. On the other hand the function dp_internalFlowOverall_DP is numerically best used for the incompressible case , where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated.

The pressure loss calculation for internal fluid flow in different geometries is further documented here.

Inputs

Name	Description
Constant inputs
IN_con	Input record for function dp_internalFlowOverall_MFLOW
Variable inputs
IN_var	Input record for function dp_internalFlowOverall_MFLOW
Input
dp	Pressure loss [Pa]

Outputs

Name	Description
M_FLOW	Output of function dp_overall_MFLOW [kg/s]

Modelica.Fluid.Dissipation.PressureLoss.Channel.dp_internalFlowOverall_IN_con

Information

Parameters

Name	Description
Channel
roughness	Choice of considering surface roughness
geometry	Choice of geometry for internal flow
K	Roughness (average height of surface asperities) [m]
L	Length [m]
Annular cross sectional area
d_ann	Small diameter [m]
D_ann	Large diameter [m]
Circular cross sectional area
d_cir	Internal diameter [m]
Elliptical cross sectional area
a_ell	Half length of long base line [m]
b_ell	Half length of short base line [m]
Rectangular cross sectional area
a_rec	Horizontal length [m]
b_rec	Vertical length [m]
a_tri	Length of base line [m]
Triangle cross sectional area
h_tri	Height to top angle perpendicular to base line [m]
beta	Top angle [rad]

Modelica.Fluid.Dissipation.PressureLoss.Channel.dp_internalFlowOverall_IN_var

Information

Parameters

Name	Description
Fluid properties
eta	Dynamic viscosity of fluid [Pa.s]
rho	Density of fluid [kg/m3]