Terrestrial levitation, deformation and disintegration (atomization) of liquids and melts in a one-axial acoustic standing wave

Details Terrestrial levitation, deformation and disintegration (atomization) of liquids and melts in a one-axial acoustic standing wave Terrestrial levitation, deformation and disintegration (atomization) of liquids and melts in a one-axial acoustic standing wave

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aipc..197...71l&link_type=abstract

Drops and bubbles: third international colloquium. AIP Conference Proceedings, Volume 197, pp. 71-80 (1990).

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Testing In Microgravity Environments

Scientific paper

When a liquid drop is levitated on earth in a one-axial acoustic levitator, it deforms under the action of radiation and Bernoulli pressure. With increasing product of Bond number Bo=ρs/σsα0 2g0 (σs-surface tension, ρs-density, a0-radius, g0=9.81 m/s2) and levitation safety factor φs, its shape varies from spheroid to ``doughnut,'' until, at a critical value of Bo . φs the drop will either disintegrate or (at large viscosity) self-inflate to a shell or a multibubble foam structure. Measurements of the drop aspect ratio are presented and compared with the theoretical prediction for an optimized levitator. Drop disintegration and self-inflation is demonstrated with video recordings.
Practical applications such as acoustical measurement of the Bond number and atomization of drops or liquid jets, fed continuously into the tuned standing wave, are presented. The ``contactless standing wave atomization'' is a new, valuable technique for containerless supercooling of melts, providing a wide spectrum of droplet size and respective rates with small quantities of any desirable material of technical or scientific interest.

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