Numerical Analysis of Bubble Behavior in Magnetic Fluid under Nonuniform Magnetic Field.

Abstract

The effect of a nonuniform magnetic field on bubble behavior in a pipe flow of magnetic fluid is numerically analyzed in order to realize effective boiling and high performance in a new energy conversion system using boiling two-phase flow of magnetic fluid. The governing equations of a single bubble in Poiseuille flow of magnetic fluid are presented and the translational motion and growth process of bubble are numerically calculated considering the effect of various additional forces which act on the bubble. It is found that the bubble velocity in a flow of magnetic fluid is strongly influenced by the magnetic field strength due to the effect of magnetic body force. Also, the effect of various additional forces which influence bubble behavior is accurately estimated. These fundamental studies show that precise control of bubble behavior is possible by effective use of the magnetic force acting on the fluid.