Abstract
A novel moving-boundary technique using acid-base neutralization was applied to truly vertical bubble columns to find axial dispersion coefficient. In addition, the effect of slight vertical misalignment (0.25 and 0.5°) was measured and showed increases in dispersion coefficient as much as two orders of magnitude. Using a punctured rubber membrane as a sparger, it was observed that ideal bubbly flow was maintained up to superficial gas velocities of around 4 cm/s for a column 14 cm in diameter. Photographic evidence along with the moving-boundary measurements suggest the proper turbulence length scale is the diameter of the bubble. The Baird-Rice isotropic turbulence model, suitably modified to account for changing length scales, produced an excellent fit of the bubbly-regime data.
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