Dependence of the function defined by Eq. (11) on the ion-to-electron temperature ratio for different values of the flow velocity normalized to the ion thermal velocity, . Symbols are the result of numerical calculation, solid line corresponds to . With increasing the numerical results tend to this asymptote at lower values .
The ratio of the effective screening length to the electron Debye radius as a function of the ion flow velocity normalized to the ion thermal velocity, for three different values of electron-to-ion temperature ratio . Symbols are the exact numerical results of the linear kinetic approach. Solid lines correspond to the semiqualitative approximation of Eq. (5). In the regimes and the results of both approaches coincide. At the same time the numerical results exhibit faster convergence of to than the simple approximation of Eq. (5) predicts in the intermediate regime .
The ion flow velocity dependencies of (a) the dimensionless grain charge (where and are the grain charge number and radius, respectively, and is the electron temperature), (b) effective screening length as calculated from the semiqualitative approximation of Eq. (5), and (c) averaged scattering parameter (where is the ion temperature). The ion flow velocity is normalized to the ion thermal velocity, .
(a) The dependence of the ion drag force on the normalized ion flow velocity, . The curve is calculated using the general expression of Eq. (18) and a representative set of complex plasma parameters (see text). (b) The ratio of the ion drag force to the electric force as a function of the electric field (solid line). Dashed line shows the dependence of on as found from the Frost approximation (Ref. 50). Points of intersection of these curves with the horizontal dotted line correspond to and . For complex plasma parameters investigated in this paper this occurs at and , respectively.
Article metrics loading...
Full text loading...