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Title: The classification of magnetohydrodynamic regimes of thermonuclear combustion

Physical properties of magnetohydrodynamic (MHD) reaction fronts are studied as functions of the thermodynamic conditions, and the strength and orientation of the magnetic field in the unburned matter through which the fronts propagate. We determine the conditions for the existence of the various types of MHD reaction fronts and the character of the changes in physical quantities across these reaction fronts. The analysis is carried out in general for a perfect gas equation of state and a constant energy release, and then extended to thermonuclear reaction fronts in degenerate carbon-oxygen mixtures and degenerate helium in conditions typical of Type Ia supernova explosions. We find that as unburned matter enters perpendicular to a reaction front, the release of energy through burning generates shear velocity in the reacting gas that, depending on the type of reaction front, strengthens or weakens the magnetic field. In addition, we find that the steady-state propagation of a reaction front is impossible for certain ranges of magnetic field direction. Our results provide insight into the phenomena of MHD thermonuclear combustion that is relevant to the interpretation of future simulations of SN Ia explosions that have magnetic fields systematically incorporated.
Authors:
 [1] ;  [2]
  1. Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637 (United States)
  2. Department of Astronomy and Astrophysics, the Enrico Fermi Institute, and the Computational Institute, The University of Chicago, Chicago, IL 60637 (United States)
Publication Date:
OSTI Identifier:
22370444
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 794; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON; CLASSIFICATION; COMBUSTION; ELEMENT ABUNDANCE; EQUATIONS OF STATE; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; OXYGEN; SIMULATION; STEADY-STATE CONDITIONS; THERMODYNAMIC MODEL; THERMONUCLEAR REACTIONS; TYPE I SUPERNOVAE; VELOCITY