vd/g the velocity of the droplets relative to the gas vd/w = the velocity of the droplets relative to the walls

Z = the height or length of the scrubber in cm

The following equation gives

The following equation gives the Stokes number Stk:



Impingement and Entrainment-Type Scrubber

For this type of unit (see Figure 5.18.10), the efficiency can be estimated from the following equation (Calvert et al. 1972):



Usually a value of 0.25 is chosen for f. According to Schiffter and Hesketh (1983), the drop diameter dd is about u

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