LaminarPipe wall friction for laminar flow in circular tubes (linear correlation) |
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Package Contents
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Return mass flow rate m_flow as function of pressure loss dp, i.e., m_flow = f(dp), due to wall friction |
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Return pressure loss dp as function of mass flow rate m_flow, i.e., dp = f(m_flow), due to wall friction |
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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 |
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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: true Type: Boolean Description: = true, if mu_a/mu_b are used in function, otherwise value is not used |
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| use_roughness |
Value: false Type: Boolean Description: = true, if roughness is used in function, otherwise value is not used |
| use_dp_small |
Value: false Type: Boolean Description: = true, if dp_small is used in function, otherwise value is not used |
| use_m_flow_small |
Value: false 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 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.