过滤器阻力损失 Filter resistance loss ΔP--阻力损失, Pa ΔP-- Resistance loss ,Pa λ--摩擦系数,无因次 λ--Friction coefficient , Dimensionless Re-雷诺数, Re=(ω·dn)/u,无因次 Re-Reynolds number ,Re=(ω·dn)/u,Dimensionless ω-流体速度, m/s ω-Fluid velocity ,m/s ρ-流体密度, kg/m3 ρ-Fluid density ,kg/m 3 μ-动力粘度, kg/m·s μ-Dynamic viscosity ,kg/m· s u-运动粘度 u=μ /ρ,m2/s u-movement viscosity u=μ/ρ,m2/s L-当量直管段长度, m,类管件过滤器查阅下表“类管件过滤器公称直径与