Magnetic field dissipation in converging flows

The Multifractal Spectrum of the Dissipation Field in Turbulent Flows

It has been pointed out (Mandelbrot 1974) that the turbulent energy dissipation field has to be regarded as a non-homogeneous fractal and that other more general quantities than the fractal dimension of its support have to be invoked for describing its scaling (metric) properties completely. This work is an attempt on amplifying this idea by using direct experimental data, and on making proper ...

The effect of magnetic field on 2-D problem of generalized thermoelasticity with energy dissipation

Parallel magnetic field suppresses dissipation in superconducting nanostrips.

The motion of Abrikosov vortices in type-II superconductors results in a finite resistance in the presence of an applied electric current. Elimination or reduction of the resistance via immobilization of vortices is the "holy grail" of superconductivity research. Common wisdom dictates that an increase in the magnetic field escalates the loss of energy since the number of vortices increases. He...

Noncircular converging flows in viscous gravity currents

We study the filling of a dry region ~cavity! within a viscous liquid layer on a horizontal plane. In our experiments the cavities are created by removable dams of various shapes surrounded by a silicon oil, and we measure the evolution of the cavity’s boundaries after removal of the dams. Experimental runs with circular, equilateral triangular, and square dams result in circular collapse of th...

Magnetic Field Limitations on Advection-dominated Flows

Recent papers discussing advection-dominated accretion Ñows (ADAF) as a solution for astrophysical accretion problems should be treated with some caution because of their uncertain physical basis. The suggestions underlying ADAF involve ignoring the magnetic Ðeld reconnection in heating of the plasma Ñow, assuming electron heating due only to binary Coulomb collisions with ions. Here we analyze...