We explore the magnetohydrodynamics of Dirac fermions in neutral graphene in
the Corbino geometry. Based on the fully consistent hydrodynamic description
derived from a microscopic framework and taking into account all peculiarities
of graphene-specific hydrodynamics, we report the results of a comprehensive
study of the interplay of viscosity, disorder-induced scattering,
recombination, energy relaxation, and interface-induced dissipation. In the
clean limit, magnetoresistance of a Corbino sample is determined by viscosity.
Hence the Corbino geometry could be used to measure the viscosity coefficient
in neutral graphene.Comment: 13 pages, 11 figure