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CHARACTERISTIC EFFECTS OF A TWO-FLUID NOZZLE ON ELECTRICAL CHARGING OF A SPRAY

Electrohydrodynamic characteristics of an inductive two- fluid nozzle have been investigated. The nozzle has been examined using an experimental setup in order to supply simultaneous and steady lines of compressed air, liquid feed and high voltage. The compressed air pressure plays a crucial role in the air and liquid flowrat.es, whereas the charging voltage shows no significant effect on the flowrates. Although an increase in the air pressure ex­hibits a positive role on the spray charging, by forming a dielectric layer on the charging electrode, it weakens the main induction charging, due to the air ionization. The resultant of these two roles provides an optimum air pressure which shifts toward greater values as the charging voltage increases. The liquid flowrate effect appears to cause electrode wetting, which degrades the spray charging efficiency, However, an increase in the ait- pressure postpones the occurrence of this negative effect to the larger liquid flowrates.