Investigations of the effect of electrode gap on the performance of a corona charger having separated corona and charging zones

Domat, Maidá; Kruis, Frank Einar; Fernández‐Díaz, J. M.

doi:10.1016/j.jaerosci.2013.08.017

Cited by 15 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Diffusion charging is well documented with experimental results (Adachi et al 1987;Alonso, Martin and Alguacil 2006;Biskos, Reavell and Collings 2005;Chen, Jiang and Chen 2019;Choi and Kim 2007;Domat, Kruis and Fernandez-Diaz 2014b;Hewitt 1957;Laitinen and Keskinen 2016;Medved et al 2000;Park, An and Hwang 2007;Pui, Fruin and McMurry 1988;Qi and Kulkarni 2012;Vivas, Hontañón and Schmidt-Ott 2008;, numerical models (Alonso, Alguacil and Borra 2009;Biskos, Mastorakos and Collings 2004;Domat, Kruis and Fernandez-Diaz 2014a;Nishida et al 2019) and theoretical approaches (Bricard 1949;Fuchs 1963;Marlow and Brock 1975;Veshchunov 2021;White 1951). Diffusion charging follows a stochastic mechanism leading to charge distributions of particles of a given diameter.…”

Section: Introductionmentioning

confidence: 78%

Effect of aerosol concentration on post-corona unipolar diffusion charging: Ion density retro-controlled by aerosol space charge versus geometry of ion-aerosol mixing

Jidenko

Bouarouri

Borra

2021

Aerosol Science and Technology

View full text Add to dashboard Cite

The influence of aerosol concentration on the charge per particle is investigated in post-DC corona diffusion chargers for particle diameter between 10 nm and 1 µm. Particles are charged as they pass through the charger volume by collection of ions; the ion concentration decreases along the same path due to unipolar space charge repulsion and collection on walls. With crossflow of ions and aerosols, the final mean charge per particle decreases by up to one order of magnitude with increasing aerosol concentration from 10 9 to 10 11 m -3 . The evolution of the ion density profile along particle trajectories with aerosol concentration is shown to be due to the consumption of ions by aerosol charging and to ion dispersion by unipolar space charge repulsion including ions and charged particles. Both are investigated using a simplified 1.5D model with axial symmetry and homogeneous mixing of ions and aerosols. It is shown that, for a given operating condition, the aerosol space charge is responsible for the modification of the spatial ion distribution and the related lower Niand charge per particle reported at higher aerosol concentration. From calculations, we define the maximal aerosol concentration to keep the mean charge per particle unaffected by aerosol space charge in the optimal case of homogeneous mixing of ion and aerosol. Finally, the comparison of different ion-aerosol mixing conditions highlights that an axial symmetry of the charger reduces the influence of aerosol space charge. This effect of aerosol concentration on the particle charge is critical for aerosol chargers devoted to electric mobility selection for size measurements or focused electro-deposition, as well as for concentration measurements as performed using emerging low cost sensors based on corona chargers.

show abstract

Section: Introductionmentioning

confidence: 78%

Effect of aerosol concentration on post-corona unipolar diffusion charging: Ion density retro-controlled by aerosol space charge versus geometry of ion-aerosol mixing

Jidenko

Bouarouri

Borra

2021

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

“…By imposing an ion-driving Park et al (2009) + n/a n/a n/a n/a Kimoto et al (2010) + / - 3.0% at 3.4 nm (+) 4.2% at 3.4 nm (−) Qi et al (2007) Corona No n/a 5.4-9.0 × 10 6 6.1 at 4 nm (+) Han et al (2008) Carbon fiber ionizer No +2.3-4 kV 4.4-9.6 × 10 12 60% at 20 nm (+) Qi et al (2008) Corona No n/a n/a 19-80% at 10-50 nm (+) Tsai et al (2008) Corona Yes No n/a n/a 38.9-87.8% at 7-30 nm Domat et al (2014b) Corona No +2.0-4.5 kV n/a 24.9-81.5% at 9-40 nm (+) Alonso and Huang (2015) Corona No +2.8-3.5 kV n/a 4-48% at 4-10 nm (+) Fig. 8.…”

Section: Recent Progresses In Unipolar Charger Designmentioning

confidence: 99%

“…Besides, Domat et al (2014b) investigated the effect of electrode gap on the performance of a corona charger with separated corona and charging zones. Similarly, the ion chamber is concentric to the outer casing and surrounded by the particle flow, which was shown in a theoretical study (Alonso et al, 2009) to be the best configuration for unipolar diffusion chargers.…”

Section: Recent Progresses In Unipolar Charger Designmentioning

confidence: 99%

Developments in Unipolar Charging of Airborne Particles: Theories, Simulations and Measurements

Zheng

Chang

Yang

et al. 2016

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Charging of airborne particle is an important process in both scientific studies and industrial applications, of which the unipolar charging takes up the major part due to higher charging efficiency. In order to understand the charging mechanism of airborne particles, accordingly to predict the efficiency of unipolar chargers, different theoretical models have been proposed and investigated in all regimes. Numerical techniques have been also adopted by researchers to analyze the charging process of airborne particles and thus to model the unipolar chargers. On the other hand, with the advent and application of various measuring techniques, the electric charges measurement of airborne particles was made possible for researchers. In this work, we mainly present a summary of these models, numerical techniques and experimental results on unipolar charging in all regimes, as well as the recent developments in the design of unipolar chargers, trying to briefly overview the development in this research field.

show abstract

“…Instead of using a pin-to-plate type corona charger, which is used in ELPI, a wire-to-rod type corona charger serves as the particle charger for the ECI, since it has been reported that in pin (needle) type corona devices, the usage of a pin can wear the pin out and change its geometry, leading to a change in charging efficiency levels. The usage of a pin can also promote the formation of new particles, either from erosion and sputtering from the pin itself or from gaseous contaminants present in the gas (Alonso et al, 2006;Kleefsman and van Gulijk, 2008;Domat et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Evaluation of a Laboratory-made 200 nm Precut Electrical Cascade Impactor

Han

Seo

Park

et al. 2018

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Increasing public concern regarding air quality has led to the development of efficient aerosol-monitoring techniques. Among the various aerosol measurement instruments based on electrical methods, in this study, an electrical cascade impactor (ECI) was designed and fabricated in our laboratory and was used to measure the real-time size distribution of submicron-sized aerosols. In the study by Park et al. (2007), it was assumed that the size distribution of incoming particles follows a unimodal lognormal distribution. However, in this study, the distribution of particles captured at each stage (including the Faraday cage) was assumed to be a unimodal lognormal distribution; hence, the incoming particles may follow any size distribution. After the particle charging characteristics were obtained for different particle sizes, experiments were performed with monodisperse test particles to determine the collection efficiency of each stage. The current measured in each stage was converted into a number based size distribution of aerosols by using the data inversion algorithm, which utilized the experimentally obtained collection efficiency. Then, a performance evaluation was performed, both in the laboratory and in the field. The results obtained by our ECI were in agreement with the scanning mobility particle sizer (SMPS) data.

show abstract

Investigations of the effect of electrode gap on the performance of a corona charger having separated corona and charging zones

Cited by 15 publications

References 29 publications

Effect of aerosol concentration on post-corona unipolar diffusion charging: Ion density retro-controlled by aerosol space charge versus geometry of ion-aerosol mixing

Effect of aerosol concentration on post-corona unipolar diffusion charging: Ion density retro-controlled by aerosol space charge versus geometry of ion-aerosol mixing

Developments in Unipolar Charging of Airborne Particles: Theories, Simulations and Measurements

Design and Performance Evaluation of a Laboratory-made 200 nm Precut Electrical Cascade Impactor

Contact Info

Product

Resources

About