Non-self-sustained discharge in nitrogen with a condensed dispersed phase

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This paper investigates the interaction of two dust particles in non-equilibrium plasma at elevated pressures. On the basis of asymptotic shielding theory resulting in two-exponential shielding the electrostatic energy of two charged fine particles is determined. The electrostatic energy dependence on interparticle distance proves to have a minimum as in an equilibrium plasma. The electrostatic interaction force of the particles is calculated. This force is proved to be non-symmetric: for different charges the force acting on one dust particle was not equal to the force acting on the other dust particle. This is due to non-symmetric charge separation in the vicinity of different charged dust particles. It is stated that likely charged particles repel each other and at the closest approach the attraction is only possible. Relationships to determine the modified nonideality parameter for the interaction potential, which consisted of two exponents with different shielding lengths, were obtained.

Section: Calculation Of the Electrostatic Energy Using Numerical Simumentioning

confidence: 88%

Shielding and Interaction of Dust Particles in Non‐Equilibrium Plasma

Starostin

Филиппов

Paĺ

et al. 2007

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“…The electron temperature is assumed to be constant in all computational domain (see [11]), all transfer and recombination coefficients are assumed to be constant correspondingly. Microparticle charging calculation procedure is described in [12,13] in more detail.…”

Section: Numerical Calculations Of Microparticle Charging and Screenimentioning

confidence: 99%

Microparticle Charge Screening in Non‐Equilibrium Plasmas with Two Types of Positive Ions

Филиппов

Derbenev

2009

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The study of screening a microparticle charge in a plasma taking into account sinks of electrons and ions to the microparticle and bulk processes of their production and loss in a plasma is reported. The research objective is to investigate the effect of the conversion of atomic ions Ar + to molecular ones Ar + 2 on character of screening in a plasma with an external ionization source. It is determined that the plasma due to the ion conversion consists of two positive ion species. This circumstance leads to the three-exponential charge screening, moreover there exists a region of plasma parameters where all the screening constants have comparable values. Numerical simulation of microparticle charging on the basis of the drift-diffusion approach is performed and comparison of the obtained data with the analytical results is fulfilled.

“…There were observed, under specific conditions, the liquid-like quasi-stationary and dynamic (gas vortices) dust clouds. Investigations of the influence of dust particles on the parameters of non-self-sustained (NSS) discharge at atmospheric pressure were carried out in the pulse mode and could not find out dusty structures [17,18].…”

Section: Introductionmentioning

confidence: 99%

A Dusty Plasma in a Non‐Self‐Sustained Gas Discharge at Atmospheric Pressure

Fiippov

Babichev

Paĺ

et al. 2016

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A non-self-sustained (NSS) discharge at atmospheric gas pressure containing dust particles is studied. The NSS discharge was controlled by a stationary electron beam with energy up to 120 keV. A numerical model of the NSS discharge is based on the drift-diffusion approach for electrons and ions and self-consistently takes into account effects of the dust particles on the electron and ion densities. The dusty component is described by the number balance equation and the equation of motion for dust particles with allowance for the Stokes force, gravity force and electric force in the cathode sheath. Interaction between dust particles is described in the self-consistent field approximation. It is established that, at a given gas ionization rate and given applied voltage, there is a critical dust particle size above which the levitation condition in the cathode sheath cannot be satisfied.