This component defines only the laminar region of wall friction: dp = k*m_flow, where "k" depends on density and dynamic viscosity. The roughness of the wall does not have an influence on the laminar flow and therefore argument roughness is ignored. Since this is a linear relationship, the occurring systems of equations are usually much simpler (e.g., either linear instead of non-linear). By using nominal values for density and dynamic viscosity, the systems of equations can still further be reduced.
In UsersGuide the complete friction regime is illustrated. This component describes only the Hagen-Poiseuille equation.
Extends from Modelica.Fluid.Pipes.BaseClasses.WallFriction.PartialWallFriction (Partial wall friction characteristic (base package of all wall friction characteristics)).
| Name | Description |
|---|---|
massFlowRate_dp | Return mass flow rate m_flow as function of pressure loss dp, i.e., m_flow = f(dp), due to wall friction |
massFlowRate_dp_staticHead | Return mass flow rate m_flow as function of pressure loss dp, i.e., m_flow = f(dp), due to wall friction and static head |
pressureLoss_m_flow | Return pressure loss dp as function of mass flow rate m_flow, i.e., dp = f(m_flow), due to wall friction |
pressureLoss_m_flow_staticHead | Return pressure loss dp as function of mass flow rate m_flow, i.e., dp = f(m_flow), due to wall friction and static head |
| Type | Name | Value | Description |
|---|---|---|---|
Boolean | dp_is_zero | false | = true, if no wall friction is present, i.e., dp = 0 (function massFlowRate_dp() cannot be used) |
final Boolean | use_dp_small | false | = true, if dp_small is used in function, otherwise value is not used |
final Boolean | use_m_flow_small | false | = true, if m_flow_small is used in function, otherwise value is not used |
final Boolean | use_mu | true | = true, if mu_a/mu_b are used in function, otherwise value is not used |
final Boolean | use_Re_turbulent | false | = true, if Re_turbulent input is used in function, otherwise value is not used |
final Boolean | use_roughness | false | = true, if roughness is used in function, otherwise value is not used |
Extends from Modelica.Fluid.Pipes.BaseClasses.WallFriction.PartialWallFriction.massFlowRate_dp (Return mass flow rate m_flow as function of pressure loss dp, i.e., m_flow = f(dp), due to wall friction).
| Type | Name | Description |
|---|---|---|
Pressure | dp | Pressure loss (dp = port_a.p - port_b.p) |
Density | rho_a | Density at port_a |
Density | rho_b | Density at port_b |
DynamicViscosity | mu_a | Dynamic viscosity at port_a (dummy if use_mu = false) |
DynamicViscosity | mu_b | Dynamic viscosity at port_b (dummy if use_mu = false) |
Length | length | Length of pipe |
Diameter | diameter | Inner (hydraulic) diameter of pipe |
Area | crossArea | Inner cross section area |
Length | roughness | Absolute roughness of pipe, with a default for a smooth steel pipe (dummy if use_roughness = false) |
AbsolutePressure | dp_small | Regularization of zero flow if |dp| < dp_small (dummy if use_dp_small = false) |
ReynoldsNumber | Re_turbulent | Turbulent flow if Re >= Re_turbulent (dummy if use_Re_turbulent = false) |
| Type | Name | Description |
|---|---|---|
MassFlowRate | m_flow | Mass flow rate from port_a to port_b |
Extends from Modelica.Fluid.Pipes.BaseClasses.WallFriction.PartialWallFriction.massFlowRate_dp_staticHead (Return mass flow rate m_flow as function of pressure loss dp, i.e., m_flow = f(dp), due to wall friction and static head).
| Type | Name | Description |
|---|---|---|
Pressure | dp | Pressure loss (dp = port_a.p - port_b.p) |
Density | rho_a | Density at port_a |
Density | rho_b | Density at port_b |
DynamicViscosity | mu_a | Dynamic viscosity at port_a (dummy if use_mu = false) |
DynamicViscosity | mu_b | Dynamic viscosity at port_b (dummy if use_mu = false) |
Length | length | Length of pipe |
Diameter | diameter | Inner (hydraulic) diameter of pipe |
Real | g_times_height_ab | Gravity times (Height(port_b) - Height(port_a)) |
Area | crossArea | Inner cross section area |
Length | roughness | Absolute roughness of pipe, with a default for a smooth steel pipe (dummy if use_roughness = false) |
AbsolutePressure | dp_small | Regularization of zero flow if |dp| < dp_small (dummy if use_dp_small = false) |
ReynoldsNumber | Re_turbulent | Turbulent flow if Re >= Re_turbulent (dummy if use_Re_turbulent = false) |
| Type | Name | Description |
|---|---|---|
MassFlowRate | m_flow | Mass flow rate from port_a to port_b |
Extends from Modelica.Fluid.Pipes.BaseClasses.WallFriction.PartialWallFriction.pressureLoss_m_flow (Return pressure loss dp as function of mass flow rate m_flow, i.e., dp = f(m_flow), due to wall friction).
| Type | Name | Description |
|---|---|---|
MassFlowRate | m_flow | Mass flow rate from port_a to port_b |
Density | rho_a | Density at port_a |
Density | rho_b | Density at port_b |
DynamicViscosity | mu_a | Dynamic viscosity at port_a (dummy if use_mu = false) |
DynamicViscosity | mu_b | Dynamic viscosity at port_b (dummy if use_mu = false) |
Length | length | Length of pipe |
Diameter | diameter | Inner (hydraulic) diameter of pipe |
Area | crossArea | Inner cross section area |
Length | roughness | Absolute roughness of pipe, with a default for a smooth steel pipe (dummy if use_roughness = false) |
MassFlowRate | m_flow_small | Regularization of zero flow if |m_flow| < m_flow_small (dummy if use_m_flow_small = false) |
ReynoldsNumber | Re_turbulent | Turbulent flow if Re >= Re_turbulent (dummy if use_Re_turbulent = false) |
| Type | Name | Description |
|---|---|---|
Pressure | dp | Pressure loss (dp = port_a.p - port_b.p) |
Extends from Modelica.Fluid.Pipes.BaseClasses.WallFriction.PartialWallFriction.pressureLoss_m_flow_staticHead (Return pressure loss dp as function of mass flow rate m_flow, i.e., dp = f(m_flow), due to wall friction and static head).
| Type | Name | Description |
|---|---|---|
MassFlowRate | m_flow | Mass flow rate from port_a to port_b |
Density | rho_a | Density at port_a |
Density | rho_b | Density at port_b |
DynamicViscosity | mu_a | Dynamic viscosity at port_a (dummy if use_mu = false) |
DynamicViscosity | mu_b | Dynamic viscosity at port_b (dummy if use_mu = false) |
Length | length | Length of pipe |
Diameter | diameter | Inner (hydraulic) diameter of pipe |
Real | g_times_height_ab | Gravity times (Height(port_b) - Height(port_a)) |
Area | crossArea | Inner cross section area |
Length | roughness | Absolute roughness of pipe, with a default for a smooth steel pipe (dummy if use_roughness = false) |
MassFlowRate | m_flow_small | Regularization of zero flow if |m_flow| < m_flow_small (dummy if use_m_flow_small = false) |
ReynoldsNumber | Re_turbulent | Turbulent flow if Re >= Re_turbulent (dummy if use_Re_turbulent = false) |
| Type | Name | Description |
|---|---|---|
Pressure | dp | Pressure loss (dp = port_a.p - port_b.p) |
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