An experimental study examining the relationship between bubble shape and rise velocity

Individual bubbles ca. 2.5mm in diameter were produced at a capillary in water containing frother, polymer or inorganic salt. Bubble aspect ratio (shape) and rise velocity were measured ca. 1.2m above the point of generation. Results suggest a unique relationship between bubble shape and rise velocity which is independent of solute type or concentration. [Display omitted] •Bubbles ca. 2.5mm in diameter were produced at a capillary.•Frother, polymer or inorganic salt solutions tested.•Bubble aspect ratio (shape) and velocity were measured.•Unique bubble shape–velocity relationship was found.•Relationship independent of solute type and concentration.