Solids holdup in the wake of a single bubble in a liquid-solid fluidized bed
- Ohio State Univ., Columbus, OH (USA). Dept. of Chemical Engineering
The wake structure behind large bubbles rising in a three-dimensional fluidized bed was investigated through measurements of the local solids holdup. A dual light transmittance probe allowed the measurement of the local solids concentration both in the bed and immediately above the bed surface. 160, 326, 460, and 760 micron glass beads were used as the fluidized solids and the large single bubbles were of spherical-cap shape. The light transmittance probe proved effective in measuring the solids concentration profile behind a single bubble for both 160 and 326 micron glass bead systems. The solids holdup profile was found to depend on position within the wake relative to the central axis and a stable wake size could be identified. The ratio of the average solids holdup in the wake to the mean solids holdup was found to decrease with a decrease in the mean solids holdup in the liquid-solid fluidized bed, but this decrease was less extensive for beds of smaller size particles. Comparison of the in-bed wake solids holdup data with visual observation of the single bubble immediately above the bed surface show good agreement. Observed stable wake size data is in reasonable agreement with published data for two-dimensional fluidized beds.
- OSTI ID:
- 5357737
- Report Number(s):
- CONF-881143--
- Country of Publication:
- United States
- Language:
- English
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