Mass Transfer At Helical Coils In Bubble Columns

S. A. Nosier and M. M. Mohamed

Abstract
Mass transfer rates at the outer surfaces of helical coil were studied by measuring the rate of diffusion-controlled dissolution of a helical copper coil in acidified chromate solution. Variables studied were; air superficial velocity, solution temperature and the number of active rings per coil. The mass transfer coefficient was found to increase with increasing airflow rate. Increasing the number of active rings per coil decrease the mass transfer coefficient. The mass transfer data were correlated by the equation: J = 0.778 (Fr ⋅ Re)–0.263 (dt/lw)0.245

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Keywords
mass transfer, Bubble columns, solid-liquid, helical coil, diffusion controlled, gas sparging