Kinetic theory viscosity

Details Kinetic theory viscosity Kinetic theory viscosity

2004-03-17

arxiv.org/abs/astro-ph/0403407v1

Mon.Not.Roy.Astron.Soc. 351 (2004) 1187

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07847.x

We show how the viscous evolution of Keplerian accretion discs can be understood in terms of simple kinetic theory. Although standard physics texts give a simple derivation of momentum transfer in a linear shear flow using kinetic theory, many authors, as detailed by Hayashi & Matsuda 2001, have had difficulties applying the same considerations to a circular shear flow. We show here how this may be done, and note that the essential ingredients are to take proper account of, first, isotropy locally in the frame of the fluid and, second, the geometry of the mean flow.

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