FLUID DYNAMIC INVESTIGATION OF POLISHING THE INNER WALL OF A TUBE UTILIZING A MAGNETIC COMPOUND FLUID (MCF)

抄録

In this study, we investigated the mechanism of polishing the inner wall of a tube utilizing a magnetic compound fluid (MCF) from a hydrodynamic viewpoint. We conducted polishing experiments by filling a tube with a MCF consisting of abrasive grains and applying a rotating magnetic field perpendicular to the tube axis. In addition, in order to clarify the polishing mechanism, we performed visualization experiments by observing the behavior of the abrasive grains and measuring the pressure distribution on the inside surface of the tube using a hydrodynamic technique. This study demonstrated that a magnetic field distribution for effective polishing should exist in the region furthest from the centerline between the magnetic poles in the tube. At this position, the abrasive grains are located on the sides of the walls of the inner tube of the clusters formed along the line of magnetic force and the pressure generated is effective for polishing. The pressure distribution has a flat valley profile. Therefore, the radial force of clusters formed near these locations is considered to impart a processing force to the abrasive grains