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

Calculation of pressure loss in edged bends with sharp corners at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness.

There are larger pressure losses in an edged bend compared to a curved bend under the same conditions. The effect of a sharp corner in an edged bend on the pressure loss is much larger than the influence of 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_edgedOverall_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. See more information .