Void fraction correlations are widely available in the literature for two-phase gas-liquid flows in pipes, but no general consensus exists with regard to the effect of pipe inclination. By means of an air-water two-phase flow test setup employing quick-closing valves, the pressure drop and the void fraction were systematically measured for various pipe inclinations and volume flow rates. Both mean values and standard deviations were recorded. The experimental data were compared with predictions of representative correlations recommended in the literature. It is found that void fraction predictions of drift-flux models were in excellent agreement with the present measurements.

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