Anti-agglomeration of spark discharge-generated aerosols via unipolar air ions

Kyu Tae Park, Massoud Massoudi Farid, Jungho Hwang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This paper reports the effect of air ions on the reduction of the agglomeration of metal aerosol particles generated from a homogeneous spark discharge. A carbon fiber ionizer was used to generate air ions near the spark channel formed between two metal electrodes. Once the air ions were generated, particles mixed with ions from the ionizer became charged by random collisions resulting from Brownian motion of the ions. Under the experimental conditions, the particle size right after the spark generation was about 4. nm. Then, the size increased to 50. nm, 1. m downstream (residence time of 1.76. s) of the spark channel due to Brownian agglomeration when there were no air ions injected. However, with the injection of air ions (ion concentration: particle concentration=10:1), the size of the particles was reduced to be around 10. nm due to the repulsive force between unipolar charged particles with an average charge number of 0.39. In this study, the classical Brownian agglomeration theory for unipolar charged particles was combined with the moment method to predict the particle size distribution as a function of time. The theoretically determined particle size distribution was in good agreement with the size distribution measured using a scanning mobility particle sizer (SMPS) system.

Original languageEnglish
Pages (from-to)144-156
Number of pages13
JournalJournal of Aerosol Science
Volume67
DOIs
Publication statusPublished - 2014 Jan 1

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Aerosols
Electric sparks
agglomeration
Discharge (fluid mechanics)
Agglomeration
Ions
aerosol
ion
air
Air
particle size
Charged particles
Particle size analysis
Metals
Brownian motion
Brownian movement
metal
Method of moments
Particles (particulate matter)
Carbon fibers

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

Cite this

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title = "Anti-agglomeration of spark discharge-generated aerosols via unipolar air ions",
abstract = "This paper reports the effect of air ions on the reduction of the agglomeration of metal aerosol particles generated from a homogeneous spark discharge. A carbon fiber ionizer was used to generate air ions near the spark channel formed between two metal electrodes. Once the air ions were generated, particles mixed with ions from the ionizer became charged by random collisions resulting from Brownian motion of the ions. Under the experimental conditions, the particle size right after the spark generation was about 4. nm. Then, the size increased to 50. nm, 1. m downstream (residence time of 1.76. s) of the spark channel due to Brownian agglomeration when there were no air ions injected. However, with the injection of air ions (ion concentration: particle concentration=10:1), the size of the particles was reduced to be around 10. nm due to the repulsive force between unipolar charged particles with an average charge number of 0.39. In this study, the classical Brownian agglomeration theory for unipolar charged particles was combined with the moment method to predict the particle size distribution as a function of time. The theoretically determined particle size distribution was in good agreement with the size distribution measured using a scanning mobility particle sizer (SMPS) system.",
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Anti-agglomeration of spark discharge-generated aerosols via unipolar air ions. / Park, Kyu Tae; Farid, Massoud Massoudi; Hwang, Jungho.

In: Journal of Aerosol Science, Vol. 67, 01.01.2014, p. 144-156.

Research output: Contribution to journalArticle

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AB - This paper reports the effect of air ions on the reduction of the agglomeration of metal aerosol particles generated from a homogeneous spark discharge. A carbon fiber ionizer was used to generate air ions near the spark channel formed between two metal electrodes. Once the air ions were generated, particles mixed with ions from the ionizer became charged by random collisions resulting from Brownian motion of the ions. Under the experimental conditions, the particle size right after the spark generation was about 4. nm. Then, the size increased to 50. nm, 1. m downstream (residence time of 1.76. s) of the spark channel due to Brownian agglomeration when there were no air ions injected. However, with the injection of air ions (ion concentration: particle concentration=10:1), the size of the particles was reduced to be around 10. nm due to the repulsive force between unipolar charged particles with an average charge number of 0.39. In this study, the classical Brownian agglomeration theory for unipolar charged particles was combined with the moment method to predict the particle size distribution as a function of time. The theoretically determined particle size distribution was in good agreement with the size distribution measured using a scanning mobility particle sizer (SMPS) system.

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