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Plasma-wall boundary layers.

V Baritello1, F Porcelli, F Subba

  • 1Istituto Nazionale di Fisica della Materia and Politecnico di Torino, 10129 Turin, Italy.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|April 24, 2002
PubMed
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Plasma boundary layers near surfaces are analyzed. Ion viscosity and charge separation allow quasineutrality even above Mach 1, challenging the Bohm criterion in viscous plasma flows.

Area of Science:

  • Plasma physics
  • Fluid dynamics
  • Surface science

Background:

  • Boundary layers are known to form in plasmas adjacent to solid surfaces.
  • The structure of these layers is influenced by plasma properties.

Purpose of the Study:

  • To investigate the impact of charge separation and ion viscosity on plasma boundary layer structure.
  • To critically examine the Bohm criterion in light of these effects.

Main Methods:

  • Utilizing a one-dimensional two-fluid plasma model.
  • Employing asymptotic matching techniques to analyze boundary layer structures.
  • Defining and solving a nonlinear boundary value problem.

Main Results:

  • Charge separation and ion viscosity significantly influence boundary layer structure.

Related Experiment Videos

  • Quasineutrality is found to hold even for Mach numbers exceeding unity in the viscous limit.
  • The study provides a critical discussion of the established Bohm criterion.

    • Conclusions:

    • The findings challenge conventional understanding of plasma boundary layers, particularly concerning the Bohm criterion.
    • Ion viscosity plays a crucial role in maintaining quasineutrality in certain plasma flow regimes.
    • Advanced mathematical techniques are effective in resolving complex boundary layer phenomena.