.TRANSFORM.Fluid.FittingsAndResistances.PerforatedPlate .TRANSFORM.Fluid.FittingsAndResistances.PerforatedPlateMinor-loss resistance for a perforated plate (multi-hole orifice / flow distributor) in a pipe. The loss uses the same thin-orifice correlation as a single orifice but with the total open-area ratio (porosity):
dp = K*m_flow^2/(2*rho*A_face^2),K = [1 + 0.707√(1-a) - a]²/a²
referenced to the full (face) pipe velocity, where
a is the open-area ratio – either given directly as
porosity, or computed from nHoles and
diameter_hole (a =
nHoles·(d_hole/d_pipe)²). Common for core inlet plates and
flow distributors. Symmetric; circular face; thin-plate (no
hole-length friction).
Idelchik, I. E. Handbook of Hydraulic Resistance, Begell House (perforated plate / sharp-edged orifice).