This information is part of the Modelica Standard Library maintained by the Modelica Association.

Calculation of pressure loss for an internal flow through different geometries at overall flow regime for incompressible and single-phase fluid flow considering surface roughness.

Generally this function is numerically best used for the compressible case if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated. On the other hand the function dp_internalFlowOverall_DP is numerically best used for the incompressible case, where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated.

The pressure loss calculation for internal fluid flow in different geometries is further documented here.

M_FLOW = dp_internalFlowOverall_MFLOW(IN_con, IN_var, dp)

IN_con	Type: dp_internalFlowOverall_IN_con Description: Input record for function dp_internalFlowOverall_MFLOW
IN_var	Type: dp_internalFlowOverall_IN_var Description: Input record for function dp_internalFlowOverall_MFLOW
dp	Type: Pressure (Pa) Description: Pressure loss

M_FLOW	Type: MassFlowRate (kg/s) Description: Output of function dp_overall_MFLOW