Standard tank configuration

Figure 7-11. Power curve for the standard tank configuration. (Source Holland, F. A. and Bragg, R. Fluid Flow for Chemical Engineers, 2nd ed., Edward Arnold, 1995.)...

Calculate the theoretical power for a six-hlade, flat-hlade turhine without baffles, hut with the standard tank configuration shown in Table 7-2. Use the same data as in Example 7-1. 

Figure 5.8 shows the power curve for the standard tank configuration geometrically illustrated in Figure 5.5. Since this is a baffled non-vortexing system, equation 5.20 applies.

The power curve for the standard tank configuration is linear in the laminar flow region AB with a slope of —1.0. Thus in this region for ReM< 10, equation 5.20 can be written as... 

Power curve for the standard tank configuration without baffles... 

Calculate the theoretical power for a six-blade flat blade turbine agitator with diameter DA = 3 m running at a speed of N = 0.2 rev/s in a tank system conforming to the standard tank configuration illustrated in Figure 5.5. The liquid in the tank has a dynamic viscosity p = 1.0Pas and a density of p = 1000 kg/m3. 

The tank dimensions required for this capacity are predetermined by selection of a standard tank configuration. The nearest tank sizing of this capacity has an inside diameter of 15.2 m (50 ft.) with a tank height of 10.7 m (35 ft.) This gives a tank capacity of 1950 m3. 

The authors determined correlation constants C and a for five common types of impellers (two axial-flow impellers and three radial-flow impellers) and four impeller locations within a standard tank configuration. The specific power requirement can then be estimated by using Eq. (15-177). The power required to disperse one liquid phase... 

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