Electrohydrodynamic atomization in the cone-jet mode physical modeling of the liquid cone and jet

Citation
Rpa. Hartman et al., Electrohydrodynamic atomization in the cone-jet mode physical modeling of the liquid cone and jet, J AEROS SCI, 30(7), 1999, pp. 823-849
Citations number
17
Categorie Soggetti
Chemical Engineering
Journal title
JOURNAL OF AEROSOL SCIENCE
ISSN journal
00218502 → ACNP
Volume
30
Issue
7
Year of publication
1999
Pages
823 - 849
Database
ISI
SICI code
0021-8502(199908)30:7<823:EAITCM>2.0.ZU;2-E
Abstract
A physical model has been developed which is able to calculate the shape of the liquid cone and jet, the electric fields in and outside the cone, and the surface charge density at the liquid surface. The model also estimates the liquid velocity at the cone surface. The results of this cone-shape mod el fit well with experimental values with respect to the cone shape, and th e current as function of the flow rate, the conductivity, the applied poten tial, and the electrode configuration. The simulations have shown that a sp raying nozzle with a diameter of 1 mm yields a 15% higher current than an 8 mm nozzle. For the 8 mm nozzle the current is almost independent of the ap plied potential, where for the 1 mm nozzle a stronger relation was found. T he space charge due to the charged droplets has an influence of about 5-7% on the electric field at the cone surface. The jet diameter, was calculated and measured as a function of the liquid flow rate, and compared to the dr oplet size scaling laws. A new derivation of a current scaling law will be given. (C) 1999 Elsevier Science Ltd. All rights reserved.