Thin-film profile around long bubbles in square microchannels measured by chromatic interference method

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Applied Physics Letters, ISSN: 0003-6951, Vol: 109, Issue: 4

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Haosheng Chen; Zhongnan Li; Jiang Li
AIP Publishing
Physics and Astronomy
article description
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, the film has a thickness of order Caat the center and order Caat the sides, while for x ∼ Ca, the film at the sides thins to order Ca, which matches well with the existing theoretical results.