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We consider a quasi steady laminar axisymmetric flow of Bingham type under the assumption that the yield stress increases at a rate proportional to the internal power dissipation. Such a behaviour has been observed in coal-water slurries. Many different cases can occur (including the appearance of a rigid shell at the boundary of the pipeline), which are(More)
PAST AND ACTUAL RESEARCH DIRECTIONS: singular space-time in General Relativity (until 1980) then Dynamic and static dispersions, emulsions of two or more immiscible liquid components , mathematical problems in earth sciences, dynamics of non Newtonian fluids, dynamical models for the evolution of multiphase and multicomponent fluids in porous or fractured(More)
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