Abstract
The present investigation describes, in detail, a data processing strategy for characterizing bubble sizes and shapes properly from shadowgraph images in diluted bubble swarm conditions. A flat pseudo-two-dimensional bubble column is studied, where two different bubble types (ellipsoidal and spherical caps) can be injected through two different spargers. Various statistical equivalent diameters (D10, D20, D30, D32) are considered, and the morphology is characterized via the eccentricity (χ) as a function of the size. To further broaden the experimental conditions, several Newtonian liquids characterized by different viscosities and gas injection rates ranging from 50 to 200 lh are used. Additionally, an original method for verifying results, using control parameters such as orientation and solidity, is presented.
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