QuadraticTurbulentPipe wall friction for turbulent flow in circular tubes (simple characteristic, mu not used) |
 |
Package Contents
 |
Return mass flow rate m_flow as function of pressure loss dp, i.e., m_flow = f(dp), due to wall friction |
 |
Return pressure loss dp as function of mass flow rate m_flow, i.e., dp = f(m_flow), due to wall friction |
 |
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 |
Package Constants (6)
| use_mu |
Value: false Type: Boolean Description: = true, if mu_a/mu_b are used in function, otherwise value is not used |
|---|---|
| use_roughness |
Value: true Type: Boolean Description: = true, if roughness is used in function, otherwise value is not used |
| use_dp_small |
Value: true Type: Boolean Description: = true, if dp_small is used in function, otherwise value is not used |
| use_m_flow_small |
Value: true Type: Boolean Description: = true, if m_flow_small is used in function, otherwise value is not used |
| dp_is_zero |
Value: false Type: Boolean Description: = true, if no wall friction is present, i.e., dp = 0 (function massFlowRate_dp() cannot be used) |
| use_Re_turbulent |
Value: false Type: Boolean Description: = true, if Re_turbulent input is used in function, otherwise value is not used |
Information
This information is part of the Modelica Standard Library maintained by the Modelica Association.
This component defines only 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.
In UsersGuide the complete friction regime is illustrated. This component describes only the asymptotic behaviour for large Reynolds numbers, i.e., the values at the right ordinate where λ is constant.