.TRANSFORM.Fluid.ClosureRelations.PressureLoss.Functions.Tees.K_branchConverging_Crane

Information

Branch loss coefficient for a combining-flow tee or wye (Crane TP-410), referenced to the combined (run-outlet) velocity head. The branch-angle dependence enters through F (linearly interpolated: 30°→1.74, 45°→1.41, 60°→1.0, 90°→0). Can be negative. Validated against Crane Example 7-35 (K_branchConverging_Crane(0.1023,0.1023,0.018917,0.00633,90°) = -0.0404).

References

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

Interface

function K_branchConverging_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_branchConverging_Crane;