Abstract

A fully kinetic self-consistent model of an absorbing particle immersed in stationary isotropic weakly collisionalplasma has been developed. The combined effects of particle size and ion-neutral charge exchange collisionshave been investigated for intermediate regimes, where no analytic theories are available. It is shown thatcollisional effects related to the ion orbital destruction (presence of extrema in ion flux collected on the particlesurface and in particle potential and charge) are important for small particles, while they are totally absent forlarge particles. The potential distribution around the particle is quite well represented by a Yukawa form, butwith an effective screening length that shows different dependences from the gas pressure for small and largeparticle size. Analytical fitting formulas of particle charge and potential and screening length depending on theparticle radius parameter and on the Knudsen number have been obtained.

Autore Pugliese

• Taccogna Francesco

Tutti gli autori

• Taccogna F.

Titolo volume/Rivista

Contributions to plasma physics

Anno di pubblicazione

2012

ISSN

1521-3986

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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