Parametric study of electrostatically charged sprays

Conference · Fri Dec 01 04:00:00 EST 1989

OSTI ID:6973598

Barnhart, J S; Durbin, T E; Peters, J E ^[1]; Leong, K H ^[2]

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1. Illinois Univ., Urbana, IL (USA). Dept. of Mechanical and Industrial Engineering
2. Argonne National Lab., IL (USA)

Electrostatically charged sprays are used in a wide range of applications. They include the coating of surfaces as with paint spraying, the production of fine powders and the control of pollutants. The phenomenon of electrostatic spraying has been much researched particularly for the cases of dielectric fluids in paint spraying and conductive fluids in fine metallic powder production. although the literature on electrostatic spraying is voluminous, the parametric dependence of the size distribution of the spray under various conditions still lacks precise definition. The focus of this study is the generation of charged water droplets for the production of ions and radicals in flue gases by pulsed corona discharges to control SO{sub 2} and NO{sub x}. As a first step in evaluating charged sprays for such use, a laboratory-scale injection system was evaluated by measuring atomization performance of needle injectors over a wide range of parameters. Sauter mean diameter (SMD) determined with a Phase/Doppler Particle Analyzer (PDPA) was used as the measure of atomization performance. The independent parameters investigated include applied voltage, needle size, flow rate and NaNO{sub 3} concentration (used to vary the solution conductivity). Because the spray was only about 2 mm wide at the sampling point, SMD measured at a single location was taken to be representative of the spray. This assumption was tested by taking radial traverses through the spray. Current flow from the needle to a collector plate 6 cm below was measured with and without solution flow to quantify the relative current-carrying capacities of the spray and the surrounding air. 4 refs., 6 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6973598
• Report Number(s): CONF-9005168-1; ON: DE90010580
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
420400* -- Engineering-- Heat Transfer & Fluid Flow
426000 -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
ATOMIZATION
CONCENTRATION RATIO
CONTROL
CORONA DISCHARGES
CURRENT DENSITY
DENSITY
DISPERSIONS
DOPPLER EFFECT
DROPLETS
ELECTRIC DISCHARGES
ELECTRIC POTENTIAL
ELECTROSTATICS
EQUILIBRIUM
FLOW RATE
HYGROMETRY
INJECTION
INTAKE
MEASURING INSTRUMENTS
MEASURING METHODS
MIXTURES
PARTICLES
PERFORMANCE TESTING
PHYSICAL PROPERTIES
POWDERS
PUMPS
SOLUTIONS
SPRAYS
TESTING
VOLUME