The Open UniversitySkip to content
 

Transition from a fully ionized plasma to an absorbing surfact

Almeida, N. A.; Benilov, M. S.; Franklin, Raoul and Naidis, G. V. (2004). Transition from a fully ionized plasma to an absorbing surfact. Journal of Physics D: Applied Physics, 37(22) pp. 3107–3116.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1088/0022-3727/37/22/008
Google Scholar: Look up in Google Scholar

Abstract

The ionization layer (presheath) separating a fully ionized low-temperature thermal plasma from the space-charge sheath adjacent to a solid surface is described by means of a (multi)fluid model. The character of the solution is governed by α, the ratio of the ionization length to the mean free path for ion–atom collisions. If α ≥ 1, the solution is determined by physically transparent boundary conditions, namely, by the Bohm criterion at the sheath edge and the condition of full ionization on the plasma side of the ionization layer. If α < 1, the latter condition becomes ineffective. An alternative boundary condition is found for a certain range of α below unity, αcr ≤ α < 1. An approximate approach which spans the whole range of α is suggested. While being incomplete theoretically, this approach is sufficient for practical purposes and gives results that are in agreement with experiment. On the other hand, the question of what is the lacking boundary condition in the range 0 < α < αcr remains open and challenging.

Item Type: Journal Article
Copyright Holders: 2004 IOP Publishing Ltd
ISSN: 1361-6463
Academic Unit/Department: Science > Physical Sciences
Item ID: 7987
Depositing User: Tracey Moore
Date Deposited: 12 Jun 2007
Last Modified: 19 Apr 2013 08:14
URI: http://oro.open.ac.uk/id/eprint/7987
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk