Bubble and Drop Size in Stirred Vessels

Bubble and Drop Size in Stirred Vessels 

As completely theoretical analysis is not available for such systems, empirically found correlations involving pertinent dimensional groups have been proposed. Vermeulen et al. (V3) have listed ten sets of dimensionless variables which can possibly influence the nature of the dispersions obtained. 

Out of these, six, viz. Weber number, Reynolds number, volume fraction X, viscosity ratios, density ratios, and length ratios were finally used for correlation. The other four were used but found not to improve the correlation. 

The authors have also given a unified correlation applicable to both bubbles and drops. 

Calderbank (C3) has given different correlations for drops and bubbles as well as for coalescing and noncoalescing systems. However, Jackson (Jl) has pointed out that it is unlikely that an absolute classification of this type is possible in practice, where speed of coalescence is continuously varying. 

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XVII. Bubble and Drop Size in Stirred Vessels. 354... 

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