Window with Electrostatic Protection against Dust, Smoke, and Viruses

The article analyzes the effect of dangerous aerosols on the human body. In order to purify the air from aerosols, the effect of an electric field on them is considered. The electric and dielectrophoretic forces acting on submicron particles in an inhomogeneous electric field of two parallel wires are calculated. It is shown that part of this field is identical to the field between the wire and the grounded plate electrode located in the middle between the wires. This allows using a known formula for the electric field of a two-wire line to calculate the field gradient and the effect of dielectrophoresis on neutral particles. Smoke and dust particles already carry a negative charge, and a more or less uniform electric field is enough to move them. To filter neutral water droplets infected with the virus, you need either a field with a large gradient or a corona discharge. The paper shows that the polarization of particles in an electric field causes the particles to stick together, and larger particles settle faster on the electrodes of the filter. The design of a transparent electrostatic precipitator is proposed, which can be used to protect indoor air from external smoke, dust, or viruses.

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Separation Characteristics of Submicron Particles in an Electrostatic Precipitator with Alternating Electric Field Corona Charger

Aerosol Science and Technology ◽

10.1080/02786826.2010.541530 ◽

2011 ◽

Vol 45 (3) ◽

pp. 393-400 ◽

Cited By ~ 20

Author(s):

Wen-Yinn Lin ◽

Yuan-Yi Chang ◽

Chen-Ting Lien ◽

Churng-Wen Kuo

Keyword(s):

Electric Field ◽

Electrostatic Precipitator ◽

Submicron Particles ◽

Alternating Electric Field

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Dielectrophoretic classification of fibres: principles and application to glass fibres suspended in air

EPJ Web of Conferences ◽

10.1051/epjconf/201921302053 ◽

2019 ◽

Vol 213 ◽

pp. 02053

Author(s):

Frantisek Lizal ◽

Milan Maly ◽

Jakub Elcner ◽

Arpad Farkas ◽

Ondrej Pech ◽

...

Keyword(s):

Electric Field ◽

High Speed ◽

Deposition Velocity ◽

Uniform Electric Field ◽

Electrical Mobility ◽

Mobility Separation ◽

Neutral Particles ◽

Naturally Occurring ◽

Two Parameters

Particles exposed to an electric field experience forces that influence their movement. This effect can be used for filtration of air, or for size classification of aerosols. The motion of charged particles in a non-uniform electric field is called electrophoresis. Two processes are involved in this phenomenon: 1) charging of particles and 2) electrical mobility separation. If fibres are exposed to electrophoresis, they are separated on the basis of two parameters: diameter and length. Regrettably, as naturally occurring fibres are polydisperse both in diameter and length, the electrophoresis is not very efficient in length classification. In contrast, dielectrophoresis is the motion of electrically neutral particles in a non-uniform electric field due to the induced charge separation within the particles. As deposition velocity of fibres induced by dielectrophoretic force strongly depends on length and only weakly on diameter, it can be used for efficient length classification. Principles of length classification of conducting and non-conducting fibres are presented together with design of a fibre classifier. Lastly, images of motion of fibres recorded by high-speed camera are depicted.

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Performance of a cyclone combined with electrostatic precipitator

International Review of Applied Sciences and Engineering ◽

10.1556/irase.2.2011.2.5 ◽

2011 ◽

Vol 2 (2) ◽

pp. 107-110

Author(s):

E. Kiss

Keyword(s):

Electric Field ◽

Electrostatic Precipitator ◽

Airborne Particles ◽

Dust Particles ◽

Penetration Data

Abstract In the present investigation a cylindrical electrostatic precipitator was built into a cyclone's outlet tubes, and was tested at various dusts and voltages. It has been found that the penetration (the unremoved fraction of the dust) for the airborne particles (d < 10 mm) in the case of working built in electrostatic precipitator, decreased to 5–10% of the penetration of the (only) mechanical cyclone operation. The penetration data is given at various dusts and voltages. All are proving that the method is working satisfactorily. If the voltage was smaller than the on set voltage of the discharge, the better performance could be observed. It means that with electric field it is possible to utilize the tribo-charge of the dust particles caused by the collision with the wall of the cyclone.

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