Three-dimensional measurements of single bubble dynamics in a small diameter pipe using stereoscopic particle image velocimetry

Study of bubble induced flow structure using PIV

“…The observing field is 65.5 × 87.9 mm 2 , 260 mm above the column bottom. Bubble rising velocity quickly reaches its terminal velocity after bubbles left the bubble generator (Hassan et al, 2001). The space between adjacent bubbles rising at the terminal velocities became approximately constant.…”

“…Brücker (1999) studied the wake generated by a single and a couple of rising ellipsoidal bubbles. Oritz-Villafuerte et al (2000) and Hassan et al (2001) focused their research on the turbulent motion generated in a continuous liquid phase with three-dimensional PIV. Due to the fact that the bubbles that rise in chain can be sucked into the wake of preceding ones and be influenced by liquid motion induced by front bubbles, they rise in different speeds and trajectories from a single bubble.…”

The viscosity distribution around a rising bubble in shear-thinning non-newtonian fluids

“…Chen et al (1998) observed the wake of bubbles in water. Hassan et al (2001) studied the velocity field of the bubble and Rodrigue (2004) proposed a general correlation for the drag coefficient of bubbles . Ribeiro Jr. et al (2004) studied bubble size distributions and bubble mean diameters by a photographic technique for a direct-contact evaporator operating.…”

A tomographic-PIV investigation of vapor-induced flow structures in confined jet impingement boiling

“…Hassan et al (2001) determined the bubble centroid position and orientation from stereoscopic experimental images and fit an oblate spheroid to this position in 3D space. Fujiwara et al (2004) acquired shadowgraph images of isolated bubbles from perpendicular viewing angles, allowing the integration of the bubble shape captured in one view through the profile captured in the second view.…”

“…The flow structure behind bubbles oscillating laterally in an upward flow arrangement has also been captured with PIV (Brücker, 1999;Tokuhiro et al, 1998;1999); the oscillations were shown to create additional vorticity in the bubble wake and a more uniform distribution of turbulent kinetic energy. Hassan et al (2001) studied the three-dimensional motion of a single rising air bubble in a narrow pipe with stereo particle tracking velocimetry. The vortex structures in the wakes of the bubbles showed a lack of symmetry that resulted from the three-dimensional spiraling and rocking motion of the bubble as it rose in the liquid.…”