HERSANT, F.

doi:10.1051/0004-6361/200911865

Metadatos

Licencia de uso del documento

HERSANT, F.
Université Sciences et Technologies - Bordeaux 1 [UB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]

Idioma

Article de revue

Este ítem está publicado en

Astronomy and Astrophysics - A&A. 2009, vol. 502, n° 1, p. 385-389

EDP Sciences

Resumen en inglés

Aims. Collections of dust, grains, and planetesimals are often treated as a pressureless fluid. We study the validity of neglecting the pressure of such a fluid by computing it exactly for the case of particles settling in a disk. Methods. We solve a modified collisionless Boltzmann equation for the particles and compute the corresponding moments of the phase space distribution: density, momentum, and pressure. Results. We find that whenever the Stokes number, defined as the ratio of the gas drag timescale to the orbital timescale, is more than 1/2, the particle fluid cannot be considered as pressureless. While we show it only in the simple case of particles settling in a laminar disk, this property is likely to remain true for most flows, including turbulent flows.< Leer menos

Palabras clave en inglés

Astrophysics

Instrumentation and Methods for Astrophysics

Metadatos

Licencia de uso del documento

On the pressure of collisionless particle fluids. The case of solids settling in disks

Idioma

Este ítem está publicado en

Resumen en inglés

Palabras clave en inglés

DOI

Orígen

Centros de investigación