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Ion drag force on a dust grain in a weakly ionized collisional plasma
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10.1063/1.4773438
/content/aip/journal/pop/20/1/10.1063/1.4773438
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/1/10.1063/1.4773438

Figures

Image of FIG. 1.
FIG. 1.

The dependence of the ion drag force on the flow velocity in the collisionless limit ( ) for and . Here, the solid lines (—) indicate the present results for (1) and (2a) . Symbols show the results obtained using the binary collision approach 12 for and .

Image of FIG. 2.
FIG. 2.

The dependence of the ion drag force on the flow velocity in the collisionless limit ( ) for and . Here, thesolid lines (—) indicate the present results for (1) and (2a) . Symbols show the results obtained using the binary collision approach 12 for and .

Image of FIG. 3.
FIG. 3.

The dependence of the ion drag force on the ion-neutral Knudsen number for , and . Here, the solid line (—) indicates the present results. Symbols ( ) show the results obtained using the drift-diffusion approach. 15 The values of the relative effective charge are (1), 0.390 (2), 0.405 (3), 0.420 (4), 0.450 (5), 0.478 (6), 0.495 (7), and 0.522 (8). The dashed line (– – –) indicates the zero level.

Image of FIG. 4.
FIG. 4.

The distributions of the normalized ion and electron concentrations (a) and distributions of the normalized charge density (b) along the axis of symmetry for different values of the ion-neutral Knudsen number in the case of , and . The arrows show the flow direction. In (a), the solid lines (—) indicate the normalized concentration of ions , and the dashed lines (– – –) indicate the normalized concentration of electrons . In (b), the normalized charge is given by , where and . Note that far from the grain the quasineutrality condition holds .

Image of FIG. 5.
FIG. 5.

The dependence of the ion drag force on the flow velocity in the highly collisional regime. The curves are shown for two different values of the ion-neutral Knudsen number in the case of and . Here, the solid lines (—) indicate the present results for (1) and (2a) . The dashed line (– – –) indicates the value of the ion drag force obtained using the formula derived in Ref. 47 [see Eq. (48) ].

Image of FIG. 6.
FIG. 6.

The distributions of the normalized ion and electron concentrations along the axis of symmetry for two values of the normalized flow velocity in the case of , and . The arrows show the flow direction. The solid lines (—) indicate the normalized concentration of ions , and the dashed lines (– – –) indicate the normalized concentration of electrons .

Image of FIG. 7.
FIG. 7.

The ratio of the normalized ion drag force to the normalized neutral drag force . The results are shown for different values of the normalized flow velocity and electron-to-ion temperature ratio in the case of . Here, the solid line (—) indicates the velocity dependence of the ratio in the case of . Symbols ( ) show the values of the ratio at for different values of the electron-to-ion temperature ratio: (1), 3 (2), and 5 (3).

Tables

Generic image for table
Table I.

The plasma parameters used in our calculations.

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/content/aip/journal/pop/20/1/10.1063/1.4773438
2013-01-03
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ion drag force on a dust grain in a weakly ionized collisional plasma
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/1/10.1063/1.4773438
10.1063/1.4773438
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