.TRANSFORM.Fluid.ClosureRelations.PressureLoss.Functions.Tees.K_runDiverging_Crane

Information

Run (straight-through) loss coefficient for a dividing-flow tee or wye (Crane TP-410), referenced to the combined (run-inlet) velocity head: K_run = M·Qr², with M a piecewise function of the diameter ratio and flow ratio Qr = Q_branch/Q_comb. Can be slightly negative (pressure recovery in the run). Validated against Crane Example 7-36 (K_runDiverging_Crane(0.146,0.146,0.02525,0.01583,45°) = -0.0681).

References

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

Interface

function K_runDiverging_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 (unused; included for a uniform interface)";
  output Units.NonDim K "Resistance coefficient";
end K_runDiverging_Crane;