Document Type
Thesis
Date of Award
5-31-1983
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical Engineering
First Advisor
K. Denno
Second Advisor
Kenneth Sohn
Third Advisor
Joseph J. Strano
Abstract
Ferromagnetic liquids are superparamagnetic in character possessing paramagnetic as well as an almost loose ferromagnetic behavior. The magnetization response has been treated by classical mathematical techniques and computer methods for different excitation functions.
Also, experimental work has been carried out to study the gyromagnetic phenomenon exhibited by ferric fluids when subjected to external magnetic fields. The experimental set-up consists of a solenoid wound around a glass tube channel through which ferrofluid can be circulated at different velocities. The experimental results revealed that saturation occurs at certain level as the field intensity is increased and prior to this point, resonance takes place where the gyromagnetic power reaches its peak. The results also showed that the point of resonance for different flow velocities fluctuates about a certain value of field intensity.
On the instrumentation side, a pulse field magnetometer has been designed, that measures the magnetic moment of the dipoles in the ferrofluids as a function of time. With the help of this, the relaxation phenomenon after the pulse field removal was observed. The relaxation of ferrofluids appeared to consist of a decay, the time duration of which was of the order of a few milliseconds. This pointed out that the magentized dipoles in the experimental set-up had ample time to reorient themselves randomly after they left the channel, at velocities under consideration, thus revealing no residual orientation as one might speculate.
Information obtain in this work is of a great importance in systems where water-based ferromagnetic fluids will be the continuum of energy conversion as in Redox flow batteries and in the application of such liquids as insulating barriers against electromagnetic fields.
Recommended Citation
Velingker, Avinash Narcinva, "Investigation of the behavior of ferromagnetic liquids in magnetic fields" (1983). Theses. 3648.
https://digitalcommons.njit.edu/theses/3648
