.Modelica.Thermal.FluidHeatFlow.Interfaces.Partials.SimpleFriction

Information

Definition of relationship between pressure drop and volume flow rate:

• -V_flowLaminar < VolumeFlow < +V_flowLaminar: laminar, i.e., linear dependency of pressure drop on volume flow.
• -V_flowLaminar > VolumeFlow or VolumeFlow < +V_flowLaminar: turbulent, i.e., quadratic dependency of pressure drop on volume flow.

Linear and quadratic dependency are coupled smoothly at V_flowLaminar / dpLaminar. Quadratic dependency is defined by nominal volume flow and pressure drop (V_flowNominal / dpNominal). See also sketch at diagram layer.