ROBERT DE SAINT VINCENT, Matthieu; CASSAGNÈRE, Sébastien; PLANTARD, Joël; DELVILLE, Jean-Pierre

doi:10.1007/s10404-012-0955-1

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ROBERT DE SAINT VINCENT, Matthieu
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
School of Physics and Astronomy [St Andrews]

CASSAGNÈRE, Sébastien
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

PLANTARD, Joël
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Microfluidics and Nanofluidics. 2012-09, vol. 13, n° 2, p. 261-271

Springer Verlag

Résumé en anglais

We developed an optical, microfabrication-free approach for performing real-time measurements of individual droplet characteristics (frequency of production, velocity, and length) flowing in a transparent microfluidic channel. Our approach consists in an interpretation of the differential signal produced by a pair of photodiodes connected head-to-tail due to the variations of illumination at the passage of a droplet. We checked the relevance of this zero-background method by comparing results to video measurements, and observed a very good agreement at rates up to the kHz range. Moreover, since the measured values are stored in a simple text file, flow characterization over very long times (several hours) becomes accessible. We applied this facility to perform three examples of longterm studies: stationary regimes, transient regimes, and the effect of an external forcing. Several unexpected features, like long-period fluctuations, can thus be evidenced.< Réduire

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Digital microfluidics

Flow characterization

Measurement in fluid dynamics

Real-time characterization

Transient regimes

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