Abstract
The drag force on a macroscopic sphere falling slowly through an unbounded ferromagnetic colloid in a uniform external magnetic field has been analyzed using magnetohydrodynamic equations derived by Shliomis. A magnetic-field-dependent shear viscosity is introduced to express the drag force in Stokes form. The apparent viscosity of the magnetized colloid obtained from the falling ball experiment is predicted to be slightly larger than the corresponding result obtained by Shliomis for capillary flow.
Original language | English |
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Pages (from-to) | 87-93 |
Number of pages | 7 |
Journal | Journal of Colloid and Interface Science |
Volume | 117 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1987 |