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X-ray computed tomography (CT) is used to explore the differences in a semi-batch bubble column operated at superficial gas velocities of Ug=3, 10, and 18cm/s. Air–water or air–water–cellulose fiber systems comprise the multiphase flow, and the bubble column has a 32.1cm internal diameter. A CT image of a phantom object composed of several air-filled tubes immersed in water is used to identify several...