Radiation-viscous boundary layer

Details Radiation-viscous boundary layer Radiation-viscous boundary layer

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..125a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 125-136.

Astronomy and Astrophysics

Astronomy

9

Boundary Layer Flow, Hydrodynamics, Radiation Pressure, Radio Jets (Astronomy), Shear Flow, Viscous Flow, Mach Number, Navier-Stokes Equation, Neutron Stars, Stellar Envelopes

Scientific paper

A viscous boundary layer (BL) is studied which is most likely to occur in astrophysical systems dominated by radiation pressure, in particular compact objects surrounded by a very optically thick envelope and radiating at close to the Eddington limit. Calculations are reported which show that a BL due to radiation viscosity behaves very differently from a 'classical' incompressible BL for flows with Mach number M much greater than unity far from the BL. In these flows the width of the BL is much larger than its incompressible value and scales as M-squared times the width of the imcompressible BL. The density inside the BL is much lower than that in the undisturbed fluid and scales as 1/M-squared with respect to the value far away from the BL. It is concluded that under certain circumstances a cocoon of low-density material will develop between a jet and its surrounding medium.

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