عنوان مقاله [English]
An induction internal-mixing two-fluid nozzle has been investigated. The nozzle design takes account of a single phase fluid mechanics viewpoint, in conjunction with the performance characteristics of a benchmark nozzle, which provides an approximate approach to the liquid conduit and the air throat parameters. The approach has been evaluated using an experimental setup capable of a simultaneous and steady supply of compressed air, liquid feed and high voltage to the nozzle. The compressed air plays a crucial role as a dielectric layer on the charging electrode, while the charging voltage improves the induction charging mechanism through strengthening the electric field intensity. At a constant voltage, there exists an optimum air pressure leading
to a maximum spray specific charge, beyond which the charging efficiency declines. Although an increase in the liquid flowrate degrades charging efficiency, due to electrode wetting, it would be postponed to greater flowrates by applying higher air pressure. The nozzle performance, in addition to comparing well with the benchmark nozzle, shows a larger spray specific charge at higher pressures and voltages, as well as having the lower consumption of compressed air under all similar conditions.