Electrohydrodynamics of an ionic liquid meniscus during evaporation of ions in a regime of high electric field
Name
PhysRevE.99.063108.pdf
Description
Published version
Size
572.37 KB
Format
Adobe PDF
Checksum (MD5)
f42556d8cc90ed53af6f622adc4bfc6f
Author(s)
Coffman, Chase Spenser
Martínez-Sánchez, Manuel
Lozano, Paulo C
Date Issued
June 2019
Journal
Physical Review E
Publisher
American Physical Society (APS)
Citation
Coffman, Chase S. et al. "Electrohydrodynamics of an ionic liquid meniscus during evaporation of ions in a regime of high electric field." Physical Review E 99, 6 (June 2019): 063108 © 2019 American Physical Society
Version
Final published version
Abstract
Numerical investigations are presented for an ionic liquid meniscus undergoing evaporation of ions in a regime of high electric field. A detailed model is developed to simulate the behavior of a stationary meniscus attached to a liquid feed system. The latter serves as a proxy for commonly utilized electrospray emitters such as needles and capillary tubes. Two solution families are identified for prototype liquid analogous to the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4). The first belongs to a regime of low electric field in which the meniscus is blunt and does not emit charge. The second belongs to a regime of high electric field in which a conelike meniscus produces charge from a sharp tip. Electrohydrodynamic features of the meniscus in this regime are presented. These reveal that the meniscus is Stokesian and hydrostatic and governed by conduction. The applied electric field influences both the shape of the meniscus and the current that it produces while the impedance of the feed system - which must be above a threshold value in order to ensure that the current, and therefore the flow, remains below a maximum value - influences the meniscus current but not the macroscopic shape. In general, this shape deviates from Taylor's idealized cone.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
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DOI of Published Version
https://doi.org/10.1103/physreve.99.063108
