On the influence of the 'alpha-turbulence' on the energy transport in accretion disks

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Accretion Disks, Energy Transfer, Magnetohydrodynamic Turbulence, Radiative Transfer, Eddy Viscosity, Luminosity, Mixing Length Flow Theory

Scientific paper

In the standard "α-theory" for thin accretion disks the non-molecular viscosity is described by the ratio α of the viscous stress to the pressure. This viscous stress is usually thought to be caused by hydrodynamic or hydromagnetic turbulence. While the viscosity is taken to cause all the luminosity, the effect of such turbulence on the energy transport is not taken into account. Here it is shown that in radiatively structured disks the assumed turbulence contributes only less than one percent of the whole energy flux.

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