Slug frequency

Crowley, C. J., Wallis, G. B., and Barry, J. J., Validation of a One-dimensional Wave Model for the Stratified to Slug Flow Regime Transition, with Consequences for Wave Growth and Slug Frequency, Int. J. Multiphase Flow, Vol. 18, pp. 249-271 (1992). 

Figure 4 Experiment vs. CMFD of slug frequency for pipe lengths L= 8m and 16m.

This means that the slug frequency is independent of the operating velocity. The only unknown in Eq. (142) is the spacing between the slugs, which has to be determined experimentally. Values of Nj from 2 up to 8 have been observed experimentally (Kehoe and Davidson, 1973b). 

Figure 15.6 Slugging characteristics for illustrative example, (a) Bed surface displacement, (b) Slugging frequencies.

Figure 15.7 The product of bed surface displacement and slugging frequency for...

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