Modelica.Fluid.Dissipation.PressureLoss.Bend

Information

Bend

Curved bend overall flow

Calculation of pressure loss in curved bends at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness. See more information.

Edged bend overall flow

Calculation of pressure loss in edged bends with sharp corners at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness. See more information .

Package Content

Name	Description
dp_curvedOverall_DP	Pressure loss of curved bend | calculate pressure loss | overall flow regime | surface roughness
dp_curvedOverall_MFLOW	Pressure loss of curved bend | calculate mass flow rate | overall flow regime | surface roughness
dp_curvedOverall_IN_con	Input record for function dp_curvedOverall_DP and dp_curvedOverall_MFLOW
dp_curvedOverall_IN_var	Input record for function dp_curvedOverall_DP and dp_curvedOverall_MFLOW
dp_edgedOverall_DP	Pressure loss of edged bend | calculate pressure loss | overall flow regime | surface roughness
dp_edgedOverall_MFLOW	Pressure loss of edged bend | calculate mass flow rate | overall flow regime | surface roughness
dp_edgedOverall_IN_con	Input record for function dp_edgedOverall_DP and dp_edgedOverall_MFLOW
dp_edgedOverall_IN_var	Input record for function dp_edgedOverall_DP and dp_edgedOverall_MFLOW

Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_curvedOverall_DP

Information

Calculation of pressure loss in curved bends at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area 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_curvedOverall_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_curvedOverall_DP
Variable inputs
IN_var	Input record for function dp_curvedOverall_DP
Input
m_flow	Mass flow rate [kg/s]

Outputs

Name	Description
DP	Output for function dp_curvedOverall_DP [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_curvedOverall_MFLOW

Information

Calculation of pressure loss in curved bends at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area 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_curvedOverall_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. See more information .

Inputs

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

Outputs

Name	Description
M_FLOW	Output for function dp_curvedOverall_MFLOW [kg/s]

Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_curvedOverall_IN_con

Information

Parameters

Name	Description
Bend
d_hyd	Hydraulic diameter [m]
delta	Angle of turning [rad]
K	Roughness (absolute average height of surface asperities) [m]
R_0	Curvature radius [m]

Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_curvedOverall_IN_var

Information

Parameters

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

Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_edgedOverall_DP

Information

Calculation of pressure loss in edged bends with sharp corners at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness.

There are larger pressure losses in an edged bend compared to a curved bend under the same conditions. The effect of a sharp corner in an edged bend on the pressure loss is much larger than the influence of 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_edgedOverall_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_edgedOverall_DP
Variable inputs
IN_var	Input record for function dp_edgedOverall_DP
Input
m_flow	Mass flow rate [kg/s]

Outputs

Name	Description
DP	Output for function dp_edgedOverall_DP [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_edgedOverall_MFLOW

Information

Calculation of pressure loss in edged bends with sharp corners at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness.

There are larger pressure losses in an edged bend compared to a curved bend under the same conditions. The effect of a sharp corner in an edged bend on the pressure loss is much larger than the influence of 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_edgedOverall_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. See more information .

Inputs

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

Outputs

Name	Description
M_FLOW	Output for function dp_edgedOverall_MFLOW [kg/s]

Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_edgedOverall_IN_con

Information

Parameters

Name	Description
Bend
d_hyd	Hydraulic diameter [m]
delta	Angle of turning [rad]
K	Roughness (absolute average height of surface asperities) [m]

Modelica.Fluid.Dissipation.PressureLoss.Bend.dp_edgedOverall_IN_var

Information

Parameters

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