Growth rate and oscillation frequency of electrified jet and droplet: Effects of charge and electric field

Boo Hyoung Bang, Min Woo Kim, Yong Il Kim, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Electrified jets are applied industrially in agriculture, automobiles, targeted drug delivery systems, spacecraft propulsion units, liquid metal sprayers, ion sources, emulsifiers, dust scavenging systems, and ink-jet printers. Electrified columnar jets experience instability caused by electrohydrodynamic interactions of the charged liquid surfaces with electric fields. Electrostatic and surface tension forces competing along the liquid surface create surface pressure differences. The temporal rise and fall of the surface pressure induce oscillations of jets and droplet. A linear theory was derived to yield a dispersion equation determining the most dominant wavelength of oscillation for a given charge level and electric field; this enabled the estimation of the diameter of an atomized droplet. In addition, the frequency of oscillation was derived for a cylindrical jet and spherical droplet. Parametric studies were performed for various charging levels and electric field strengths.

Original languageEnglish
Pages (from-to)1070-1082
Number of pages13
JournalAerosol Science and Technology
Issue number9
Publication statusPublished - 2018 Sept 2

Bibliographical note

Funding Information:
This work was supported by the National Research Council of Science & Technology (NST) grant by the Korea Government (MSIP) (No. CRC-16-02-KICT). This research was supported by the Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2016M1A2A2936760), NRF-2013R1A5A1073861, and NRF-2017R1A2B4005639.

Publisher Copyright:
© 2018, © 2018 American Association for Aerosol Research.


  • Warren Finlay

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Materials Science
  • Pollution


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