ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-472-4
ISBN Online: 978-1-56700-471-7
3rd Thermal and Fluids Engineering Conference (TFEC)
VOID FRACTION IN A NOVEL MICROBUBBLE-ENHANCED GASLIQUID MIXER
要約
This study seeks to characterize a novel gas-liquid mixer. In this air-water two-phase flow system, liquid is pumped
through a perforated plate, generating high-speed liquid jets which flow downward. The gas, on the other hand, is
sparged into the flow near the bottom of the column. Large bubbles flow upward, where they are broken by the
high-speed liquid jets flowing through the perforated plate, and then flow back downward as much smaller
bubbles, exiting the column together with the liquid through the bottom outlet. This two-phase flow system
combines several features only sparingly reported on in the literature: large column diameter (0.29 m), downflow
of liquid, and a large population of microbubbles (< 0.5 mm diameter with void fraction > 0.3 in many cases). This
study investigates the overall void fraction in this unusual flow system, as well as the axial void fraction
distribution. The void fraction is found to fit a modified drift-flux model.