14 0.4Fr 57


gas separator. If this parameter is not taken into account, then studies of the influence of the top clearance (42,65) are incomplete and difficult to extrapolate to other designs. The same can be said about the filling factor (66) given by the ratio of the gas separator volume to the total volume.

The foregoing discussion thus explains why all the correlations coincide for some ranges of these secondary variables while in other ranges they may diverge. In addition, in some cases the number of experiments may not have been sufficient to provide correlations or they may have been ill-balanced from the statistical point of view. The obvious solution to this problem lies in the collection of a large and detailed bank of reliable data that will constitute the basis for correlations with greater accuracy and validity.

The safest procedure for the prediction of the gas holdup in an ALR under design is to take data provided by researchers who have made the measurements in that par-

0.02 0.04 0.06 0.08 0.10 0.12 Superficial gas velocity (m/s)

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