Aerosol charging by bipolar ions of unequal current densities: experiments in low electric fields

Fjeld, R. J.; Gauntt, Randall O.; McFarland, Andrew R.

doi:10.1016/0021-9797(81)90012-6

Cited by 14 publications

(2 citation statements)

References 19 publications

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“…The ability of field-diffusion theory to predict particle charge acquisition is now well established. It was first verified by Liu and Kapadia (1978) for unipolar charging and subsequently by Fjeld et al (1981Fjeld et al ( ,1983 and Wu et al (1987) for bipolar charging. Even though field-diffusion theory has a rigorous theoretical basis and extensive experimental support, it is doubtful that it will become used widely by practitioners.…”

mentioning

confidence: 94%

Evaluation of Select Approximations for Calculating Particle Charging Rates in the Continuum Regime

Fjeld

McFarland

1989

Aerosol Science and Technology

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mentioning

confidence: 94%

Evaluation of Select Approximations for Calculating Particle Charging Rates in the Continuum Regime

Fjeld

McFarland

1989

Aerosol Science and Technology

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“…Porstendörfer et al (1984) presented the effect of the concentration ratio of positive and negative ions on the charge distribution by using an ion source of 14 C and the experimental results could be described by means of the diffusion charging theory. Fjeld et al (1981) have measured the charge distribution by unequal concentration of bipolar ions using two separate 241 Am sources under an electric field in order to mix ions of opposite signs. In their findings, the mean charge of particles asymptotically approaches the unipolar charging value as the ratio of positive to negative ion concentration increases.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Aerosol Charge Distribution by Surface-Discharge Microplasma Aerosol Charger (SMAC)

Kwon

Fujimoto

Kuga

et al. 2005

Aerosol Science and Technology

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The surface discharge on a dielectric barrier induced by dc pulses was successfully utilized as a stable bipolar ion source for neutralizing submicron aerosol particles where the concentration of positive and negative ions could be adjusted independently (a surface-discharge microplasma aerosol charger: SMAC; Kwon et al., 2005). The aim of this study was to determine the charge distribution obtained by the SMAC, which has been qualitatively presented in our previous study, and to investigate the effect of unequal bipolar ion concentration on the charge distribution. For this purpose, we performed quantitative analysis of the charge distribution of monodisperse particles in the size range of 30-200 nm acquired by the SMAC and compared the charge distributions with calculated charge fractions obtained from the diffusion charging theory. The ion parameters were calculated by measuring the ion mobility of positive and negative ions and they were used to obtain the analytic solutions of charge distribution. The charge distributions obtained by the equal or unequal concentration of bipolar ions adjusted by the SMAC showed general agreement with the diffusion charging theory.

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Continuum field-diffusion theory for bipolar charging of aerosols

Fjeld

Gauntt²,

McFarland

1983

Journal of Aerosol Science

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Aerosol charging by bipolar ions of unequal current densities: experiments in low electric fields

Cited by 14 publications

References 19 publications

Evaluation of Select Approximations for Calculating Particle Charging Rates in the Continuum Regime

Evaluation of Select Approximations for Calculating Particle Charging Rates in the Continuum Regime

Characteristics of Aerosol Charge Distribution by Surface-Discharge Microplasma Aerosol Charger (SMAC)

Continuum field-diffusion theory for bipolar charging of aerosols

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