A Turbulent, Transient Charged Spray Model

A transient two phase spray code has been extended to model charged sprays. The effect of an external electric field and an earthed plate, the space charge field due to drop charge and the dielectrophoretic force, caused by the gradient of the electric field within the spray are incorporated into an E-PISO algorithm. The model is validated from experimental results of a steady state axisymmetric capillary-plate geometry for which reliable drop diameter and velocity information was available from phase Doppler anemometry data and drop speed data from a particle counter-sizer velocimeter. The computational and experimental data show that transient highly charged spray dynamics can be predicted and this supports the development of the model for more challenging configurations, such as AC external electric fields and pulsed liquid injection.