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Measurement of internal circulation in droplets using laser-induced fluorescence

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Abstract

A diagnostic technique based on the oxygen quenching of laser-induced fluorescence from naphthalene has been developed to investigate whether internal circulation is important in submillimeter hydrocarbon droplets. Images have been obtained in 300–500 μm diam droplets of decane. Oxygen is absorbed into the surface liquid of initially oxygen-free droplets and quenches the naphthalene fluorescence. The resulting fluorescence image, including darker zones where oxygen is present, is recorded on a 2-D CCD detector. Computer processing of the images obtained with and without oxygen present reveals internal circulation patterns.

© 1990 Optical Society of America

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