MEASUREMENT OF DROP RISE VELOCITIES WITHIN A KUHNI EXTRACTION COLUMN

A new method is presented for the determination of droplet rise veloci ties within liquid-liquid extraction columns. This method utilizes the difference between the static drop size distribution as measured by a photographic technique and the dynamic drop size distribution as meas ured by a capillary probe technique. The ratio of the two volume densi ties multiplied by the average flow velocity is then a direct measure of the individual drop velocity. Droplet velocities measured using thi s technique are consistent with single drop velocities measured by oth er workers at low holdups. However, at higher holdups the droplet velo cities converge toward a single value rather than retaining a range of drop size dependent values.