67 Simulation of Single Nozzle Electrospray System in the Cone Jet Mode

The electrospray is sometimes improperly called electrohydrodynamic atomization. Electrohydrodynamic (EHD) has been applied in many areas, such as EHD atomization, EHD enhanced heat transfer, EHD pump, electrospray nanotechnology, etc. High voltage is applied to a liquid supplied through an emitter. Ideally the liquid reaching the emitter tip forms a Taylor cone, which emits a liquid jet through its apex. From the electrostatic field, the electric body forces have been determined and included in the Navier-Stokes equations. The model does not include any current. The predicted velocity fields for case1 and case2 were found to be consistent with published results. Simulation is carried out using ANSYS FLUENT system. The approach in this work was to simultaneously solve the coupled (EHD) and electrostatic equations. The fields of velocities and pressure, as well as electric characteristics of EHD flows, are calculated. The model does not include a droplet break-up model.