Input
Results
Round diameter D—
Velocity v—
Velocity pressure—
Equivalent rect. a × b—
Reynolds Re—
Method
For target Δp/L (Pa/m) at standard air, D ≈ 1.265·(Q^0.38)/(Δp/L)^0.176, with Q in m³/s. v = Q/A, A = πD²/4. Equivalent rectangular: De = 1.30·(a·b)^0.625 / (a+b)^0.25 — here aspect a=k·b given, solve b such that De ≈ D.