.TRANSFORM.Fluid.ClosureRelations.PressureLoss.Functions.Tees.K_runConverging_Crane

Information

Run (straight-through) loss coefficient for a combining-flow tee or wye (Crane TP-410), referenced to the combined (run-outlet) velocity head. For wyes (<75°) K = 1 - (1-Qr)² - (F/β²)Qr² with F interpolated (30°→1.74, 45°→1.41, 60°→1.0); for ~90° tees the special form K = 1.55·Qr - Qr² is used. Validated against Crane Example 7-35 (K_runConverging_Crane(0.1023,0.1023,0.018917,0.00633,90°) = 0.3258).

References

Crane Co. Flow of Fluids Through Valves, Fittings, and Pipe (Technical Paper No. 410), 2009.

Interface

function K_runConverging_Crane
  extends TRANSFORM.Icons.Function;
  input SI.Length D_run "Run (combined) pipe diameter";
  input SI.Length D_branch "Branch pipe diameter";
  input SI.VolumeFlowRate V_run "Volumetric flow in the run/straight leg (magnitude)";
  input SI.VolumeFlowRate V_branch "Volumetric flow in the branch leg (magnitude)";
  input SI.Angle angle "Angle between branch and run (tee=90 deg, wye<90 deg)";
  output Units.NonDim K "Resistance coefficient";
end K_runConverging_Crane;