Abstract
In this paper the results of the modelling of viscous flow of a fuel oil in a spray nozzle with an applied electrical field are presented. The most important effect is the emission of charges from the charge injection electrode and their spatial distribution in the fluid. For the given geometry of the nozzle, fluid properties (density, viscosity, dielectric permeability and so on), inflow rate and applied potentials at the electrodes, the numerical model gives the velocity, hydrodynamic pressure, electrical field, electrical potential and space charge density distributions. The space charges are emitted from the nozzle's outlet region forming a spray current and from the nozzle's walls (leakage current). On the basis of the calculated results, it is possible to optimize the nozzle's geometry so that the leakage current to spray current ratio is minimal.
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