A new high-frequency (> 10 kHz) AC electrospray phenomenon which behaves distinctly to DC electrosprays is investigated. Unlike DC electrosprays, the drops do not emanate from the usual well-defined Taylor cone-jet and carry no net charge. Instead, the meniscus vibrates at a resonant frequency associated with its capillary-inertia vibration time, periodically ejecting drops with dimensions of order 10 μm under the action of the Maxwell-Wagner electric stress at the meniscus tip. Above a crossover frequency, the polarization and direction of the Maxwell force reverses and an apparent electrowetting effect is observed. A simple lubrication model is used to generate spatio-temporal evolution profiles for the stretched liquid meniscus tip as a function of the Maxwell-Wagner stress and a capillary number. From a self-similar scaling technique, the meniscus is shown to advance as t1/2.
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ASME 2004 2nd International Conference on Microchannels and Minichannels
June 17–19, 2004
Rochester, New York, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4164-2
PROCEEDINGS PAPER
High Frequency AC Electrospraying of Dielectric Liquids
Leslie Y. Yeo,
Leslie Y. Yeo
University of Notre Dame, Notre Dame, IN
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Dimitri Lastochkin,
Dimitri Lastochkin
University of Notre Dame, Notre Dame, IN
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Hsueh-Chia Chang
Hsueh-Chia Chang
University of Notre Dame, Notre Dame, IN
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Leslie Y. Yeo
University of Notre Dame, Notre Dame, IN
Dimitri Lastochkin
University of Notre Dame, Notre Dame, IN
Hsueh-Chia Chang
University of Notre Dame, Notre Dame, IN
Paper No:
ICMM2004-2404, pp. 723-730; 8 pages
Published Online:
December 2, 2008
Citation
Yeo, LY, Lastochkin, D, & Chang, H. "High Frequency AC Electrospraying of Dielectric Liquids." Proceedings of the ASME 2004 2nd International Conference on Microchannels and Minichannels. ASME 2nd International Conference on Microchannels and Minichannels. Rochester, New York, USA. June 17–19, 2004. pp. 723-730. ASME. https://doi.org/10.1115/ICMM2004-2404
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