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
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.