Motion of miscible magnetic fluids in a dynamic magnetic field

Ching-Yao Chen*, Chi Yuan Liao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Displacements of a miscible magnetic layer in a capillary tube under a moving ring-shaped magnet are studied numerically. The magnet is adjusted dynamically to maintain a constant distance from the front mixing interface on the centerline. Control parameters, such as magnetic strength, effective viscosity variation due to magnetization, diffusion and the position of the magnet, are analyzed systematically. Motion of the magnetic layer is evaluated by two quantitative measurements, i.e. movement of center of gravity and spread of layer width. In general, the moving speed of the center of gravity depends only slightly on the magnetic strength, and is found slower at a higher viscosity ratio and a closer placement to the front interface as well if the magnet is placed amid the layer. A weaker spread occurs in situations of stronger magnetic strength, lower viscosity parameters and also placements near the rear interface. A multi-front finger results if the magnet is positioned ahead of the front interface.

Original languageEnglish
Pages (from-to)244-261
Number of pages18
JournalInternational Journal of Numerical Methods for Heat and Fluid Flow
Volume13
Issue number2-3
DOIs
StatePublished - 1 Jan 2003

Keywords

  • Flow
  • Magnetic fields
  • Numerical simulation

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