In this paper, experimental and numerical analyses of bubbly air-water flow in a vertical pipe at low volumetric flow rates has been carried out to quantify the effect of swirl on void fraction profiles. These investigations have been carried out at a dispersed phase volume fraction of 0.051% and at superficial flow velocities of 0.041 m/s for air and 0.76 m/s for water. The investigations revealed that the presence of swirl alters the volume fraction profiles considerably.
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