Charge and fission of droplets in electrostatic sprays

Alessandro Gomez; Keqi Tang

doi:10.1063/1.868037

journal article Jan 01, 1994

Charge and fission of droplets in electrostatic sprays

Alessandro Gomez Keqi Tang

Physics of Fluids Vol. 6 No. 1 pp. 404-414 · AIP Publishing

View at Publisher Save 10.1063/1.868037

Abstract

Measurements of the charge and size of heptane droplets generated by electrostatic sprays showed that the droplet charge-to-volume ratio is a monotonically decreasing function of size. In the useful range of electrospray operation, characterized by droplets smaller than the size of the orifice from which the liquid is issued, it was found that the larger were the droplets the closer they were to the Rayleigh limit. In particular, when droplets had charging levels between 70% and 80% of such limit, they were observed to rupture because the repulsive force due to surface charge evidently overcame surface tension. The rupture phenomenon, here termed Coulomb fission, was also captured in microphotographs that typically showed a droplet with one or two, diametrically opposed, conical protrusions terminating in a fine jet ejecting a stream of much smaller, apparently equisized offsprings. The process appeared swift and, yet, well ordered, quite different from the common view of a violent, convulsive explosion. Corroborating evidence on the disruption pattern was also gathered by quantitative measurements of the evolution of the droplet size distribution in evaporating sprays using phase Doppler anemometry (PDA). Implications of these findings are finally discussed in the context of a particular application of electrostatic sprays, electrospray ionization, a technique that is revolutionizing the mass-spectrometric analysis of large biomolecules.

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Metrics

550

Citations

43

References

Details

Published: Jan 01, 1994
Vol/Issue: 6(1)
Pages: 404-414

Authors

A

Alessandro Gomez

Department of Mechanical Engineering, Yale University, New Haven, Connecticut 06520

K

Keqi Tang

Department of Mechanical Engineering, Yale University, New Haven, Connecticut 06520

Cite This Article

Alessandro Gomez, Keqi Tang (1994). Charge and fission of droplets in electrostatic sprays. Physics of Fluids, 6(1), 404-414. https://doi.org/10.1063/1.868037

Charge and fission of droplets in electrostatic sprays

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