# Calculation Methods - Cyclone

FluidFlow can calculate the pressure loss over a cyclone separator by any one of 4 available methods. The method used is determined by your input setting "Cyclone Loss Correlation". See Perry [20] for a more detailed description. For all loss correlations inlet and outlet losses are added and these are estimated by: Inlet Loss = ΔP1 = 0.5 ρ 1 V1 2 Outlet Loss = ΔP2 = 0.5 ρ 2 V2 2 The available calculation methods are: 1. Basic Principles: ΔP = 0.5 ρ V2 (Dc/D2 - 1) where: D2 is the cyclone outlet diameter. The general literature consensus seems to be that estimating the pressure loss from first principles is not very accurate. Hence the following estimation methods are also available. 2. Miller/Lissman: ΔP = K' (Dc/D2)2 where: K' is typically 3.2 for a wide range of configurations. 3. Shepard/Lappel: ΔP = K" (D1/D2)2 where: K" is typically in the range 12 to 15. 4. Casal: ΔP = 0.5 ρ V2 Nh where: Nh = 11.4 (D1/D2)2 + 3.33