Scale-up Rules for Dilute Systems

Many processes have been scaled successfully using ND = constant. This simple rule is based on years of industrial experience. To apply it, the tank Reynolds number must be greater than 10 and vessels must be geometrically similar. Table 12-7 lists the rule and the application best suited to the rule. Other operations, such as blending and solids suspension, are included to provide the reader 

0 Constant tip speed, constant torque/volume Same maximum shear simple blending shear-controlled drop size. 

85 Off-bottom solids suspension Used in Zwietering equation for Njs, for easily suspended solids also applies to drop suspension (see Section 12-6.2). 

75 Conditions for average suspension Used for applications of average suspension difficulty. 

67 Constant P/V Used for turbulent drop dispersion fast settling solids reactions requiring micromixing gas-liquid applications at constant mass transfer rate. 

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Reactors involved with slow chemical reactions 12-8.2 Scale-up Rules for Dilute Systems... 

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