Experimental issues in the observation of water drop dynamics

Buch, Torben N.; Pardo, William B.; Walkenstein, Jonathan A.; Monti, Marco; Rosa, Epaminondas

doi:10.1016/s0375-9601(98)00606-9

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…At this position, the laser beam is refracted by the droplet's material so that a part of it is further sent outside the droplet as described in [32], i.e. in a sense opposite to the high speed camera.…”

Section: -12mentioning

confidence: 99%

“…to control if all the 90 µm diameter spot is included within the droplet under its surface or only a fraction of it. If the focus spot is placed in the droplet, refraction phenomena [32] and total reflection of the laser beam at the droplet interface with the air are produced, so that the light wave propagates under the surface within a thin layer [12]. Figure 25 shows what happens when the focus is not fully included in the droplet.…”

Section: 15mentioning

confidence: 99%

“…Once entered inside the droplet, the first contact of the laser beam with the droplet surface produces a typical cone -collar formation which propagates with relatively high speed; from frames 1 and 2 in Figure 26 generates finally micrometric droplets and the main droplet is detached from the capillary after about 2.1 ms. The cone production is somewhat equivalent with the production of whipping fluid jets by electrospinning which generate submicron jets [10,22] or polymer fibers [32,33].…”

Section: 15mentioning

confidence: 99%

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Unresonant interaction of laser beams with microdroplets

Pascu¹,

Popescu²,

Ticoş³

et al. 2012

J. Eur. Opt. Soc.-Rapid Publ.

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The interaction of distilled water droplets (volumes of 3-4 µl) with pulsed laser beams emitted at 532 nm is described. At 532 nm the distilled water absorption is very low and the interaction of a water droplet with the laser radiation is dominated by unresonant phenomena. In this case, following the collision of the laser beam with a droplet in suspended position in air, its deformations and mechanical vibrations are produced. The conditions in which the droplets lose material as a consequence of the impact with laser beams are explored. The effects produced on the droplet were studied pulse by pulse and depend on: droplet's content, beam wavelength, power and focusing, irradiation geometry and adhesion of the droplet to the capillary on which it is suspended. The laser pulses energies were varied in four steps: 0.25 mJ, 0.4 mJ, 0.7 mJ and 1 mJ. The laser pulse full time width at half maximum was 5ns and the typical beam waist diameter on the droplet was 90 µm; the beam had a relatively low divergence around the focus point. The droplet's shapes evolution is visualised by recordings performed at 10 kframes/second. Following a droplet interaction with the laser beam one may also produce at a controlled moment in time, nanodroplets propagating at high (probably supersonic) speeds and microdroplets propagating at slower speeds. One may also produce suspended droplets of smaller dimensions than the initial one as well as micro/nano gas bubbles in the suspended droplet's material/volume. In a second set of experiments the behaviour of the microdroplets of Rhodamine 6G in distilled water was recorded at high speed, at resonant interaction with similar laser pulses, and at the same power levels. The phenomena considering that the droplets contents are Newtonian liquids produced at interaction with the laser beams, are discussed.

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Section: -12mentioning

confidence: 99%

Section: 15mentioning

confidence: 99%