DC negative corona discharge characteristics in air flowing transversely and longitudinally through a needle-plate electrode gap

Berendt, A.; Budnarowska, Magdalena; Mizeraczyk, J.

doi:10.1016/j.elstat.2018.01.006

Cited by 20 publications

(14 citation statements)

References 23 publications

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“…When a high negative voltage is applied to a conductor/electrode and generated electric field is high enough, corona discharge occurred [ 12 , 13 ]. If a charged conductor/electrode has a needle-type with a sharp point, the electric field around the tip will be significantly higher than other parts and air near the electrode can become ionized and NAIs are generated [ 14 ]. Intensity of corona discharge depends on the shape and size of the conductors as well as applied voltage.…”

Section: Negative Air Ions and Their Generationmentioning

confidence: 99%

“…Intensity of corona discharge depends on the shape and size of the conductors as well as applied voltage. Irregular conductor, especially with a sharp point, gives rise to more corona than a smooth conductor and large-diameter conductors produce lower corona than small-diameter conductors; the higher the voltage applied, more NAIs are generated [ 14 , 15 ]. The closer the distance to corona point, the higher NAI concentration is detected as continuous generation of NAIs by corona discharge is related to a chain reaction process called an electron avalanche [ 16 ].…”

Section: Negative Air Ions and Their Generationmentioning

confidence: 99%

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Negative Air Ions and Their Effects on Human Health and Air Quality Improvement

Jiang

Ramachandran

2018

IJMS

154

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Negative air ions (NAIs) have been discovered for more than 100 years and are widely used for air cleaning. Here, we have carried out a comprehensive reviewing on the effects of NAIs on humans/animals, and microorganisms, and plant development. The presence of NAIs is credited for increasing psychological health, productivity, and overall well-being but without consistent or reliable evidence in therapeutic effects and with controversy in anti-microorganisms. Reports also showed that NAIs could help people in relieving symptoms of allergies to dust, mold spores, and other allergens. Particulate matter (PM) is a major air pollutant that affects human health. Experimental data showed that NAIs could be used to high-efficiently remove PM. Finally, we have reviewed the plant-based NAI release system under the pulsed electric field (PEF) stimulation. This is a new NAI generation system which releases a huge amount of NAIs under the PEF treatment. The system may be used to freshen indoor air and reduce PM concentration in addition to enriching oxygen content and indoor decoration at home, school, hospital, airport, and other indoor areas.

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Section: Negative Air Ions and Their Generationmentioning

confidence: 99%

Section: Negative Air Ions and Their Generationmentioning

confidence: 99%

Negative Air Ions and Their Effects on Human Health and Air Quality Improvement

Jiang

Ramachandran

2018

IJMS

154

View full text Add to dashboard Cite

show abstract

“…Inference and comparison of computational models electric field is high enough, a corona discharge occurs [12,13]. If a charged conductor or electrode has a type of needle with a sharp tip, the electric field around the tip will significantly be higher than elsewhere, and the air near the electrode can ionize and generate negatively charged particles [34]. The intensity of the corona discharge depends on the shape and size of the conductors, as well as the applied voltage.…”

Section: Experiments Design and Data Collectionmentioning

confidence: 99%

“…The intensity of the corona discharge depends on the shape and size of the conductors, as well as the applied voltage. An irregularly shaped conductor, especially with a sharp tip, results in more corona discharge than a smooth conductor and, large diameter conductors produce a lower corona discharge than small diameter conductors; the higher the applied voltage, the more negative ions are generated [34]. The closer the distance to the corona point, the higher the concentration of negative ions is detected, since the continuous generation of negative particles by corona discharge is related to a chain reaction process called electron avalanche [33].…”

Section: Experiments Design and Data Collectionmentioning

confidence: 99%

Comparative Study of Computational Models for Reducing Air Pollution Through the Generation of Negative Ions

Ortiz-Grisales¹,

Patiño²,

Grisales³

2021

Preprint

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Today, air quality is one of the global concerns that governments are facing. One of the main air pollutants is the particulate matter (PM) that affects human health. This article presents the modeling of a purification system by means of negative air ions (NAIs) for air pollutant removal, using computational intelligence methods. The system uses a high voltage booster output to ionize air molecules from stainless steel electrodes; its particle-capturing efficiency reaches up to 97%. With two devices (5 x 2 x 2.5 cm), 2 trillion negative ions are produced per second, and the particulate matter (PM 2.5) can be reduced from 999 to 0 mg / m3 in a period of approximately 5 to 7 minutes (in a 40 x 40 x 40 cm acrylic chamber). This negative ion generator is a viable and sustainable alternative to reduce polluting emissions, with beneficial effects on human health.

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“…When a high negative voltage is applied to a conductor/electrode and generated electric field is high enough, corona discharge occurs [15,16]. If a charged conductor/electrode has a sharp, needle-type point, the electric field around the tip will be significantly higher than for other parts, and the air near the electrode can become ionized, generating NAIs [17]. Intensity of corona discharge depends on the shape and size of the conductors as well as the applied voltage [14].…”

Section: Introductionmentioning

confidence: 99%

Generating Negative Air Ions in Construction Waterscapes at a Garden Scale

Chu

Chen

et al. 2019

Environments

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High concentrations of negative air ions (NAIs) and low concentrations of positive air ions (PAI), along with a low monopole coefficient (PAI/NAI), are likely to provide physiological and psychological benefits to the humans. A water body produces NAIs through the Lenard effect. This concept can be applied in designing garden waterscapes in residential buildings to provide fresh and healthy air for urban residents. In this study, we conducted several experiments to assess the effectiveness of different waterscape designs in producing air ions. The results revealed that increasing waterfall tiers, slopes, impact points, widths, and heights increased the NAI concentrations and reduced the values of monopole coefficients, thus providing health benefits to humans. In particular, increasing waterfall tiers and slopes increased the NAI concentrations most substantially. Moreover, we established a composite waterscape and determined that it produced fewer NAIs along with a less favorable monopole coefficient compared with the data observed at the experimentally adjusted tiers and slopes. Therefore, we suggest that simple waterscapes with multiple waterfall tiers or steep waterfall slopes should be favored over complex waterscapes. Such simple designs can help construct a garden that provides health benefits.

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DC negative corona discharge characteristics in air flowing transversely and longitudinally through a needle-plate electrode gap

Cited by 20 publications

References 23 publications

Negative Air Ions and Their Effects on Human Health and Air Quality Improvement

Negative Air Ions and Their Effects on Human Health and Air Quality Improvement

Comparative Study of Computational Models for Reducing Air Pollution Through the Generation of Negative Ions

Generating Negative Air Ions in Construction Waterscapes at a Garden Scale

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