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

• Bubbles ca. 2.5 mm 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.

Individual bubbles ca. 2.5 mm 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. 1.2 m above the point of generation. Results suggest a unique relationship between bubble shape and rise velocity which is independent of solute type or concentration.

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