The aim of the present paper is to present an experimental method for the prediction of slug-churn transition in two-phase flow. It starts with the transformation of existing flow regime maps in the literature into preselected coordinate systems, convenient for airlift pump performance presentations and continues with experimental data of the Fluid Mechanics Laboratory of the Patras University. Some hundreds of measured points for both 40 mm and 28 mm are recorded. The theoretical part of the method follows, which is believed to be the main part of the whole analysis. The drift-flux model is applied to all experimental data and drift velocity curves are drawn. The slope of one drift-flux parameter seems to present local low points (dips). An investigation of these points follows in the final step which is the validation of the proposed method. The measured and thus calculated points, presented upon the proposed regime maps, seem to be quite close to the regime transition line.

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