Abstract
To study the thin lubrication film around long bubbles with length-to-radius aspect ratio more than 10 in square capillaries, a chromatic interference method was developed. Three-dimensional profile of the lubrication film was acquired from moving long bubbles with the length-to-radius aspect ratio up to 500. The dynamics and profiles of the film were found to be dependent of the dimensionless downstream distance x of the long bubble. For 1 ≪ x ≪ Ca−1, the film has a thickness of order Ca2/3 at the center and order Ca1 at the sides, while for x ∼ Ca−1, the film at the sides thins to order Ca4/3, which matches well with the existing theoretical results.
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