Abstract

AbstractDrag reduction is reported for two phase air water liquid co‐current flow for three different pipe diameters (0.0454, 0.0508, 0.0935 m). The drag reduction was achieved without the addition of drag reducing agents such as surfactants. Drag reduction compared to single phase gas flow occurred in the stratified and the stratified plus ripple regimes and in the droplet and the stratified film plus droplet regimes at low liquid flow rates. Drag reduction compared to single phase liquid flow occurred in the stratified and the stratified roll wave and inertial wave and the bubble flow regimes at relatively low gas flows. Details of the mechanisms involved are presented.

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