packageLaminarAndQuadraticTurbulent
Pipe wall friction for laminar and turbulent flow in circular tubes (simple characteristic)
Extends from PartialWallFriction (Partial wall friction characteristic (base package of all wall friction characteristics)).
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.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | use_mu (from PartialWallFriction) | true | = true, if mu_a/mu_b are used in function, otherwise value is not used |
| Boolean | use_roughness (from PartialWallFriction) | true | = true, if roughness is used in function, otherwise value is not used |
| Boolean | use_dp_small (from PartialWallFriction) | true | = true, if dp_small is used in function, otherwise value is not used |
| Boolean | use_m_flow_small (from PartialWallFriction) | true | = true, if m_flow_small is used in function, otherwise value is not used |
| Boolean | dp_is_zero (from PartialWallFriction) | false | = true, if no wall friction is present, i.e., dp = 0 (function massFlowRate_dp() cannot be used) |
| Boolean | use_Re_turbulent (from PartialWallFriction) | true | = true, if Re_turbulent input is used in function, otherwise value is not used |
Contents
| 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 |
 Internal | Functions to calculate mass flow rate from friction pressure drop and vice versa |