Modelica.Fluid.Pipes.BaseClasses.WallFriction.LaminarAndQuadraticTurbulent

Information

This component defines the quadratic turbulent regime of wall friction: dp = k*m_flow*|m_flow|, where "k" depends on density and the roughness of the pipe and is no longer a function of the Reynolds number. This relationship is only valid for large Reynolds numbers. At Re=4000, a polynomial is constructed that approaches the constant λ (for large Reynolds-numbers) at Re=4000 smoothly and has a derivative at zero mass flow rate that is identical to laminar wall friction.

Package Content

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
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
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_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
Inherited
use_mu=true	= true, if mu_a/mu_b are used in function, otherwise value is not used
use_roughness=true	= true, if roughness is used in function, otherwise value is not used
use_dp_small=true	= true, if dp_small is used in function, otherwise value is not used
use_m_flow_small=true	= true, if m_flow_small is used in function, otherwise value is not used
dp_is_zero=false	= true, if no wall friction is present, i.e., dp = 0 (function massFlowRate_dp() cannot be used)
use_Re_turbulent=true	= true, if Re_turbulent input is used in function, otherwise value is not used

Modelica.Fluid.Pipes.BaseClasses.WallFriction.LaminarAndQuadraticTurbulent.massFlowRate_dp

Information

Inputs

Name	Description
dp	Pressure loss (dp = port_a.p - port_b.p) [Pa]
rho_a	Density at port_a [kg/m3]
rho_b	Density at port_b [kg/m3]
mu_a	Dynamic viscosity at port_a (dummy if use_mu = false) [Pa.s]
mu_b	Dynamic viscosity at port_b (dummy if use_mu = false) [Pa.s]
length	Length of pipe [m]
diameter	Inner (hydraulic) diameter of pipe [m]
roughness	Absolute roughness of pipe, with a default for a smooth steel pipe (dummy if use_roughness = false) [m]
dp_small	Regularization of zero flow if |dp| < dp_small (dummy if use_dp_small = false) [Pa]
Re_turbulent	Turbulent flow if Re >= Re_turbulent (dummy if use_Re_turbulent = false) [1]

Outputs

Name	Description
m_flow	Mass flow rate from port_a to port_b [kg/s]

Modelica.Fluid.Pipes.BaseClasses.WallFriction.LaminarAndQuadraticTurbulent.pressureLoss_m_flow

Information

Inputs

Name	Description
m_flow	Mass flow rate from port_a to port_b [kg/s]
rho_a	Density at port_a [kg/m3]
rho_b	Density at port_b [kg/m3]
mu_a	Dynamic viscosity at port_a (dummy if use_mu = false) [Pa.s]
mu_b	Dynamic viscosity at port_b (dummy if use_mu = false) [Pa.s]
length	Length of pipe [m]
diameter	Inner (hydraulic) diameter of pipe [m]
roughness	Absolute roughness of pipe, with a default for a smooth steel pipe (dummy if use_roughness = false) [m]
m_flow_small	Regularization of zero flow if |m_flow| < m_flow_small (dummy if use_m_flow_small = false) [kg/s]
Re_turbulent	Turbulent flow if Re >= Re_turbulent (dummy if use_Re_turbulent = false) [1]

Outputs

Name	Description
dp	Pressure loss (dp = port_a.p - port_b.p) [Pa]

Modelica.Fluid.Pipes.BaseClasses.WallFriction.LaminarAndQuadraticTurbulent.massFlowRate_dp_staticHead

Information

Inputs

Name	Description
dp	Pressure loss (dp = port_a.p - port_b.p) [Pa]
rho_a	Density at port_a [kg/m3]
rho_b	Density at port_b [kg/m3]
mu_a	Dynamic viscosity at port_a (dummy if use_mu = false) [Pa.s]
mu_b	Dynamic viscosity at port_b (dummy if use_mu = false) [Pa.s]
length	Length of pipe [m]
diameter	Inner (hydraulic) diameter of pipe [m]
g_times_height_ab	Gravity times (Height(port_b) - Height(port_a))
roughness	Absolute roughness of pipe, with a default for a smooth steel pipe (dummy if use_roughness = false) [m]
dp_small	Regularization of zero flow if |dp| < dp_small (dummy if use_dp_small = false) [Pa]
Re_turbulent	Turbulent flow if Re >= Re_turbulent (dummy if use_Re_turbulent = false) [1]

Outputs

Name	Description
m_flow	Mass flow rate from port_a to port_b [kg/s]

Modelica.Fluid.Pipes.BaseClasses.WallFriction.LaminarAndQuadraticTurbulent.pressureLoss_m_flow_staticHead

Information

Inputs

Name	Description
m_flow	Mass flow rate from port_a to port_b [kg/s]
rho_a	Density at port_a [kg/m3]
rho_b	Density at port_b [kg/m3]
mu_a	Dynamic viscosity at port_a (dummy if use_mu = false) [Pa.s]
mu_b	Dynamic viscosity at port_b (dummy if use_mu = false) [Pa.s]
length	Length of pipe [m]
diameter	Inner (hydraulic) diameter of pipe [m]
g_times_height_ab	Gravity times (Height(port_b) - Height(port_a))
roughness	Absolute roughness of pipe, with a default for a smooth steel pipe (dummy if use_roughness = false) [m]
m_flow_small	Regularization of zero flow if |m_flow| < m_flow_small (dummy if use_m_flow_small = false) [kg/s]
Re_turbulent	Turbulent flow if Re >= Re_turbulent (dummy if use_Re_turbulent = false) [1]

Outputs

Name	Description
dp	Pressure loss (dp = port_a.p - port_b.p) [Pa]