Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
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| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2014
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| Online Access: | http://hdl.handle.net/1721.1/91442 |
| _version_ | 1826203730198921216 |
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| author | Dozier, Kahlil A |
| author2 | Markus Zahn. |
| author_facet | Markus Zahn. Dozier, Kahlil A |
| author_sort | Dozier, Kahlil A |
| collection | MIT |
| description | Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014. |
| first_indexed | 2024-09-23T12:42:09Z |
| format | Thesis |
| id | mit-1721.1/91442 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T12:42:09Z |
| publishDate | 2014 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/914422019-04-12T11:48:39Z Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields Dozier, Kahlil A Markus Zahn. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science. Electrical Engineering and Computer Science. Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014. 6 Cataloged from PDF version of thesis. Includes bibliographical references (page 85). A ferrofluid is a collection of nanoscale ferromagnetic particles with a stabilizing surfactant in a liquid to form a colloid. The dynamic behavior of ferrofluids in the presence of magnetic fields has long been an area of research interest. A particular area of interest deals with the "spin-up" mechanisms of ferrofluids, which describe how a container of ferrofluid comes to a steady state of bulk flow when subjected to a uniform rotating external magnetic field. There are two prevailing theories that attempt to explain the spin-up mechanisms of ferrofluids: spin diffusion theory, and the presence of non-uniformities in the magnetic field, due to "demagnetizing factors" introduced by the shape of the container. This research attempts to confirm previous measurements indicating that non-uniformities in the magnetic field are the primary cause of ferrofluid bulk flow. Partial spheres and cylindrical containers of different volumes -- and thus different demagnetizing factors -- were filled with Ferrotec EFH1 oil-based ferrofluid and subjected to an external uniform rotating magnetic field for various parameters of rotation direction and magnetic field. Ferrofluid bulk flow was measured using ultrasound velocimetry, and the magnitudes and shapes of the velocity profiles were compared. Despite the complicated flows observed within the containers, enough of a trend was established to safely conclude that demagnetizing factors are often the primary cause of ferrofluid bulk flow. by Kahlil A. Dozier. M. Eng. 2014-11-04T21:37:00Z 2014-11-04T21:37:00Z 2014 2014 Thesis http://hdl.handle.net/1721.1/91442 893677315 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 119 pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Electrical Engineering and Computer Science. Dozier, Kahlil A Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields |
| title | Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields |
| title_full | Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields |
| title_fullStr | Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields |
| title_full_unstemmed | Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields |
| title_short | Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields |
| title_sort | characterizing ferrofluid spin up flow in rotating uniform magnetic fields |
| topic | Electrical Engineering and Computer Science. |
| url | http://hdl.handle.net/1721.1/91442 |
| work_keys_str_mv | AT dozierkahlila characterizingferrofluidspinupflowinrotatinguniformmagneticfields |