Title :
Finite element analysis of space charge suppression of electrostatic-induction spray charging
Author :
Cooke, J. Robert ; Law, S.Edward
Author_Institution :
Dept. of Agric. & Biol. Eng., Cornell Univ., Ithaca, NY, USA
Abstract :
A finite element analysis of the space charge suppression encountered during the electrostatic-induction spray charging process is presented. This study provides a theoretical framework in support of the experimental studies reported elsewhere of the space-charge-limiting barriers of nozzle design. Poisson´s equation is solved using a finite element axisymmetric model consisting of 3,704 triangular elements and 1,946 nodes for various placements of nearby earthen surfaces. Plots of constant potential surfaces in and around the dielectric embedded-electrode charging nozzle are presented. The axial droplet-charging potential gradient at the tip of the liquid jet (along the axis of symmetry) depends upon both the positive induction electrode potential and upon the presence, and substantially upon the spatial extent of the negatively charged cloud of dispensed droplets
Keywords :
drops; electrostatics; finite element analysis; jets; nozzles; space charge; spray coating techniques; Poisson´s equation; axial droplet-charging potential gradient; constant potential surfaces; dielectric embedded-electrode charging nozzle; dispensed droplets; electrostatic-induction spray charging; finite element analysis; finite element axisymmetric model; liquid jet; negatively charged cloud; nozzle design; positive induction electrode; space charge suppression; space charge-limiting barriers; Agricultural engineering; Clouds; Dielectrics; Electrodes; Electrostatic analysis; Finite element methods; Induction generators; Space charge; Spraying; Surface charging;
Conference_Titel :
Industry Applications Conference, 1997. Thirty-Second IAS Annual Meeting, IAS '97., Conference Record of the 1997 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-4067-1
DOI :
10.1109/IAS.1997.626292
