A new mechanism for viscosity in cloudy accretion disks - Anomalous (turbulent) viscosity

Details A new mechanism for viscosity in cloudy accretion disks - Anomalous (turbulent) viscosity A new mechanism for viscosity in cloudy accretion disks - Anomalous (turbulent) viscosity

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..280f&link_type=abstract

In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc

Astronomy and Astrophysics

Astrophysics

1

Accretion Disks, Active Galactic Nuclei, Clouds, Gas Flow, Gas Viscosity, Turbulent Flow, Gravitational Effects, Perturbation Theory, Rotating Fluids

Scientific paper

We analyze the dynamics of a rotating cloudy gaseous medium relative to 2D perturbations having wavelengths shorter than the disk thickness. The viscosity due to cloud-cloud collisions is confronted with the derived critical viscosity, below which a collective mode of perturbations in the disk is able to grow until going into the saturation regime where fully developed turbulence is established. It is shown that for the assumed parameters of AGN accretion disks consistent with the observational data, the viscosity due to collective modes usually dominates over that due to cloud-cloud collisions.

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