Influence of the shape of the inner boundary on thermomagnetic convection in the annulus between horizontal cylinders: Heat transfer enhancement

摘要

The paper studies convection in a horizontal annular gap filled with a magnetic fluid or gaseous oxygen under the influence of gravitational and magnetic forces. A current-carrying conductor and an external uniform magnetic field magnetizing an internal cylinder of a material with high magnetic permeability were considered as a source of a magnetic field. The influence of the shape of the inner cylinder and the magnitude of the magnetic field gradient on the heat transfer was studied. It is found that the strength of the magnetic field created by a current-carrying conductor is insufficient to compete with gravitational convection. In the absence of gravity, a variety of convective structures and the hysteretic nature of the transition between them were discovered. The shape of the conductor is an additional factor affected the convection.