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Image Analysis of a Moving Bubble Train in a Tube

A tube with varying cross sections can capture some essential features of the motion of foam in porous media. In this paper, experiments were carried out concerning a moving bubbles train through cylindrical ducts with sinusoidal cross-section. The test tube has total length of 1.14 m and has constrictions at interval of 0.0095 m. The visual images of a single lamella motion were recorded and were interpreted. It is found the lamella decelerates in the diverging portion while accelerates in the converging part of the tube.