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On the physics of dust grains in hot gas
Abstract
Charging of dust grains in hot (10,000-1 billion K) plasma is studied, including photoelectron and secondary electron emission, field emission, and transmission of electrons and ions through the grain. The resulting grain potentials are (for temperatures of at least about 100,000 K) considerably smaller in magnitude than found by Burke and Silk (1974). Even so, large electrostatic stresses can cause ion field emission and rapid destruction of small grains in very hot gas. Rapid rotation can also disrupt small grains, but damping (by microwave emission) usually limits the centrifugal stress to acceptable values for plasma densities of no more than about 1 per cu cm. Sputtering rates are estimated for grains in hot gas, based upon a semiempirical fit to experimental data. Predicted sputtering rates for possible grain constituents are similar to estimates by Barlow (1978), but in some cases differ significantly. Useful approximation formulas are given for the drag forces acting on a grain with arbitrary Mach number.
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Citations
Cited by
Draine, B. T. (2003) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.41.011802.094840 · Cited by 2,389
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Thomas, H., Morfill, G. E., Demmel, V., Goree, J., Feuerbacher, B., & Möhlmann, D. (1994) · Physical Review Letters · doi:10.1103/physrevlett.73.652 · Cited by 1,648
Quantum hydrodynamics for plasmas—Quo vadis?
Bonitz, M., Moldabekov, Z. A., & Ramazanov, T. S. (2019) · Physics of Plasmas · doi:10.1063/1.5097885 · Cited by 110
On secondary electron emission and its semi-empirical description
Tolias, P. (2014) · Plasma Physics and Controlled Fusion · doi:10.1088/0741-3335/56/12/123002 · Cited by 58
Taccogna, F. (2014) · The European Physical Journal D · doi:10.1140/epjd/e2014-50132-5 · Cited by 35
Metadata
- Authors
- Draine, B. T., & Salpeter, E. E.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1979-07
- Volume
- 231
- Pages
- 77
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2237565830
- Cited by
- 779
- References
- 0
- FWCI
- 6.52
- Type
- journal article
- Language
- en
- Open access
- closed
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- Draine, B. T., & Salpeter, E. E. (1979). On the physics of dust grains in hot gas. The Astrophysical Journal. https://doi.org/10.1086/157165
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