1.0 0.8 o 255 rpm,Prochem impeller (P0≈1) 0.6 350 rpm,Prochem impeller 0.4 240 rpm,Rushton turbine (P0=5) 360 rpm,Rushton turbine 0.2 0.5 1.0 1.5 Aeration rate(vvm) om Prcham Maxoand
7.2.Power Calculations Po NP-NDiP NRe= NDP 100 Laminar Transient Turbulent region 10 Turbine Paddle Propeller 0.1l 10 102103104 10510 Reynolds number(NRe） Rushton diagram over correlation between power number(Np)and Reynolds numb (NRe)for some stirrer designs
3 5 N Di Po Np = 2 Re NDi N = 7.2. Power Calculations
7.1.Single stirrer in anaerated medium Po NDip NRe= NDP u 7.2.Mutile stirrer in anaerated medium
7.1. Single stirrer in anaerated medium 7.2. Mutile stirrer in anaerated medium 3 5 N Di Po Np = 2 Re NDi N =
0.8 .Open turbine a° 0.6 Vaned disc 0.4 Paddle 0.2 0 0 0.04 0.08 0.12 Aeration number (N a) Examples of correlations between the ratio Pg/Po and the aeration number (Na)for some stirrers. Na O056 045 NDi
3 NDi Q Na = 0.45 0.56 2 3 0 ( ) Q P NDi Pg