Experimental Investigations on Bubble Turbulent Diffusion in a Vertical Large Diameter Pipe and in a Rectangular Bubble Column by means of Different Measurement Techniques

The dispersion of bubbles in a vertical two-phase flow is studied experimentally by means of wire-mesh sensors and high-speed video camera. The first technique is applied to a 200 mm pipe with flow patterns ranging from bubbly to slug/churn flow. The latter technique is instead applied to a rectangular bubble columns at low void-fractions. The experimental results are compared with numerical investigations.