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

Calculation of pressure loss in a straight pipe for overall flow regime of an incompressible and single-phase fluid flow only considering surface roughness.

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

M_FLOW = dp_overall_MFLOW(IN_con, IN_var, dp)

IN_con	Type: dp_overall_IN_con Description: Input record for function dp_overall_MFLOW
IN_var	Type: dp_overall_IN_var Description: Input record for function dp_overall_MFLOW
dp	Type: Pressure (Pa) Description: Pressure loss

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