Stirred Vessels Gas Flow Patterns

For a standard baffled agitated vessel with H = T and a single six-flat-blade disk turbine of D/T = 0.3 to 0.5 operating within the range PT/V = 500 to 

Flooding in which the impeller is overwhelmed by gas and gas-liquid contact mixing, and so on, are very poor 

Loading in which the impeller disperses the gas through the upper part of the vessel 

Complete dispersion in which gas bubbles are distributed throughout the vessel and significant gas is recirculated back to the impeller 

However, it should be noted that the published maps for disk turbines refer only to impellers with D = 0.4T for other ratios the regime boundaries should be adjusted using the appropriate correlations given below. The transitions between the various regimes generated by a gassed Rushton turbine can be characterized with tlie main dimensionless numbers, the gas flow number (FIq = Qo/ND ), the impeller Froude number (Fr = N D/g), and the geometry (D/T) (Smith et al., 1987)  

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