How does dielectric barrier discharge work?

How does dielectric barrier discharge work?

Dielectric barrier discharges (DBDs) are self-sustaining electrical discharges in electrode configurations containing an insulating material in the discharge path. This so-called dielectric barrier is responsible for a self-pulsing plasma operation and thus, the formation of a nonthermal plasma at normal pressure.

How do you get dielectric barrier discharge?

Dielectric barrier discharge (DBD) plasma is created by the electrical discharge between two electrodes separated by an insulating barrier. The process uses a high voltage of alternate current with a lower frequency. Usually, DBD devices are made by plate electrodes separated by a dielectric layer of 0.1 mm thickness.

What is dielectric barrier discharge plasma actuator?

Dielectric barrier discharge (DBD) plasma actuators are a technology which could replace conventional actuators due to their simple construction, lack of moving parts, and fast response. This type of actuator modifies the airflow due to electrohydrodynamic (EHD) force.

What is surface dielectric barrier discharge?

Surface dielectric barrier discharge (SDBD) is widely applied in the field of active flow control. In the discharge region, the surface of the control actuator appears serious dielectric degradation, which is accompanied by heat accumulation as well as an increase of gas temperature and electron temperature.

What is meant by dielectric?

dielectric, insulating material or a very poor conductor of electric current. When dielectrics are placed in an electric field, practically no current flows in them because, unlike metals, they have no loosely bound, or free, electrons that may drift through the material.

How plasma is generated in DBD?

Experimentally plasma jet and dielectric barrier discharges (DBD) have been studied. Dielectric barrier discharges are generated when high voltage is applied across the electrodes. These discharges generate energetic electrons that dissociate oxygen molecules by direct impact.

How does a plasma actuator work?

The working of these actuators is based on the formation of a low-temperature plasma between a pair of asymmetric electrodes by application of a high-voltage AC signal across the electrodes. Consequently, air molecules from the air surrounding the electrodes are ionized, and are accelerated through the electric field.

What is DBD reactor?

A Dielectric Barrier Discharge (DBD) Plasma Reactor: An Efficient Tool to Measure. the Sustainability of Non-Thermal Plasmas through the Electrical Breakdown of Gases.

What is a dielectric example?

In practice, most dielectric materials are solid. Examples include porcelain (ceramic), mica, glass, plastics, and the oxides of various metals. Dry air is an excellent dielectric, and is used in variable capacitors and some types of transmission lines. Distilled water is a fair dielectric.

What is difference between dielectric and insulator?

The major difference between an insulator and a dielectric is that an insulator opposes the flow of electrons or charges while the dielectric stores the electric charges. Dielectric materials can be polarized while insulators cannot be polarized.

What is cold plasma?

Cold plasma is a partially ionised gas comprising ions, electrons, ultraviolet photons and reactive neutrals such as radicals, excited and ground-state molecules.

How do you make non-thermal plasma?

Non-thermal plasma (NTP) is electrically energized matter in a gaseous state, and can be generated by passing gases through electric fields (Conrads and Schmidt, 2000). The mean electron energies of NTP, which is about 20 eV, are considerably higher than those of the components of the ambient gas.

What is dielectric barrier discharge ionization (dbdi)?

The design of a new ambient ionization source, termed as dielectric barrier discharge ionization (DBDI), is based on the concept of dielectric barrier discharge (DBD). The DBD is obtained at atmospheric pressure with a dielectric layer between two electrodes applied with alternating voltages [ 12, 13 ].

How is high voltage produced from a dielectric barrier?

In this technique, the high voltage is generated with a piezo-transformer, the secondary circuit of which acts also as the high voltage electrode. Since the transformer material is a dielectric, the produced electric discharge resembles properties of the dielectric barrier discharge.

What is ozone production discharge (DBD)?

Originally called silent (inaudible) discharge and also known as ozone production discharge or partial discharge, it was first reported by Ernst Werner von Siemens in 1857. On right, the schematic diagram shows a typical construction of a DBD wherein one of the two electrodes is covered with a dielectric barrier material.

What is DBD bi-polar ionization?

AtmosAir’s technology, DBD Bi-Polar Ionization, relates to the physical construction of the AtmosAir tube (electrode). ■ An AtmosAir FC tube uses a 21-inch tube (electrode) to treat approximately 2,000 square feet or 2,000 CFM. ■ A most critical difference with AtmosAir’s technology is that the electrode is inside of the AtmosAir ion tube.