Abstract
Heat transfer and hydrodynamic data have been taken in a 0.108m internal diameter bubble column with simulated axial heat transfer probes of three different external diameters, viz. 19·0, 31·8 and 50·8 mm. The air-water-glass bead system is investigated at ambient conditions for 0 and 10 weight percent of glass beds of average diameters 50, 119, and 143μm in the slurry for a range of air velocities covering different regimes. Air holdup is found to be almost independent of solids concentration, slurry particle size, and probe diameter except when the bubble coalescence is predominant in the column. On the other hand, the heat transfer coefficient while found to be independent of slurry concentration and particle diameter, is dependent on probe diameter. A correlation for heat transfer coefficient involving hydraulic diameter and air velocity is proposed.
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