Hydrodynamical resistance of pipelines with magnetic fluid coating

Possibility of pipeline resistance decrease due to coating their internal surface with light magnetic fluid, confined on the wall by nonuniform magnetic field, is discussed. Analysis of the model problem is carried out. It is shown, that despite the fact, that one part of the pipeline section is filled with magnetic fluid, a considerable decrease of hydrodynamic resistance is possible using low-viscous magnetic fluid coating. Stability of magnetic fluid layers is considered. Results of experiment on studying the surface of kerosene base magnetic fluid layer flowed about by a water flow are presented