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Experimental data for air–water two‐phase co‐current flow in two different pipe diameters were used to test the prediction of pressure drop by a number of existing theories and correlations. Several models are shown to be useful for prediction, particularly with the stratified regimes which have proved difficult to handle in the past. The model suggested by Olujic proved to be of particular value.

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Data are presented on horizontal and slightly inclinedflows at