Particle charging and agglomeration in DC and AC electric fields

Jun H. Ji, Jungho Hwang, Gwi N. Bae, Yong G. Kim

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Experiments were carried out to investigate agglomeration characteristics of bipolarly charged particles under an AC electric field and to investigate charging characteristics of particles by using wire-to-plate type DC corona chargers. A laboratory-scale setup was built and experiments were conducted at laboratory conditions. The effects of DC and AC fields on the variation of particle size distribution are discussed. Bipolar voltages of + 8 and -8 kV DC were applied to the two corona chargers, respectively. The AC electric field applied to the agglomeration section was 3.9 kV/cm (rms), and the residence time in the agglomeration section was adjusted to 1 s. Particle size distributions were measured with a cascade impactor (MOUDI). The reduction ratio of submicron particles due to AC fields with 60-500 Hz was 25-29%. The average number of elementary charge per particle was measured when the polarities of two corona chargers were either positive or negative. Current/voltage characteristics of our corona chargers were obtained for high-mass loading condition and compared with those for the no mass loading. Seventy to ninety percent of corona-induced ions were intercepted by DOS particles in the negative corona charger. The results imply that the particle charges depend on the particle mass loading, i.e. higher mass loading will cause lower particle charges.

Original languageEnglish
Pages (from-to)57-68
Number of pages12
JournalJournal of Electrostatics
Volume61
Issue number1
DOIs
Publication statusPublished - 2004 May 1

Fingerprint

particle charging
agglomeration
Particle Size
coronas
alternating current
Agglomeration
direct current
Electric fields
Particle size analysis
electric fields
DOS
Ions
Charged particles
Current voltage characteristics
particle size distribution
Experiments
Wire
impactors
particle mass
Electric potential

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Materials Science(all)
  • Materials Chemistry
  • Physics and Astronomy(all)
  • Surfaces and Interfaces

Cite this

Ji, Jun H. ; Hwang, Jungho ; Bae, Gwi N. ; Kim, Yong G. / Particle charging and agglomeration in DC and AC electric fields. In: Journal of Electrostatics. 2004 ; Vol. 61, No. 1. pp. 57-68.
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Particle charging and agglomeration in DC and AC electric fields. / Ji, Jun H.; Hwang, Jungho; Bae, Gwi N.; Kim, Yong G.

In: Journal of Electrostatics, Vol. 61, No. 1, 01.05.2004, p. 57-68.

Research output: Contribution to journalArticle

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