Study on the magnetic self-levitation of the ring permanent magnet with inserted inner cores in ferrofluid
Source abstract
Abstract
The self-levitation of a magnetized object composed of ring permanent magnet, soft magnetic pure iron core (Fe-core), and nonmagnetic aluminum core (Al-core) in ferrofluid (FF) is studied, and the focus is the influence of Fe-core (Al-core) on the magnetic fluid levitation force (MFLF) received by the immersed magnetized object. The formula for calculating MFLF is derived focusing on the gas–liquid and solid–liquid boundary interface between FF and surroundings, and experiments have been done to study the dependence between MFLF and the levitation height of the magnetized object and mass of FF. Researches show that Fe-core has a significant influence on MFLF, and the influence is determined by the magnetization of Fe-core and the distance between Fe-core and the boundary interface. In a word, the use of Fe-core is beneficial to obtain a smaller MFLF, the greater the magnetization of the Fe-core is and the closer it is to the boundary interface of FF, the smaller the MFLF is. The Fe-core near the bottom surface of the ring magnet tends to reduce the maximum MFLF corresponds to an approximate horizontal gas–liquid boundary interface when the levitation height is constant, and the Fe-core near the top surface of the ring magnet is more likely to reduce the change of MFLF caused by the disappearance of surface instability of FF. Or, in other words, the Fe-core near the top surface of the ring magnet tends to reduce the MFLF when magnetized object moves upward, and vice versa.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Characterization and Applications of Magnetic Nanoparticles · Geomagnetism and Paleomagnetism Studies · Magnetic Bearings and Levitation Dynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
Show source-provided references
1. Flexible ferrofluids: design and applications10.1002/adma.201903497 ↗
2. Recent progress in ferrofluids research: novel applications of magnetically controllable and tunable fluids10.1039/C4SM01308E ↗
3. Manipulation of ferrofluid droplets using planar coils10.1063/1.2335403 ↗
4. Bidirectional actuation of ferrofluid using micropatterned planar coils assisted by bias magnetic fields10.1016/j.sna.2011.11.007 ↗
5. A microchannel immunoassay chip with ferrofluid actuation to enhance the biochemical reaction10.1016/j.snb.2013.03.078 ↗
6. Magnetic field sensor based on cascaded microfiber coupler with magnetic fluid10.1063/1.4962177 ↗
7. Magnetic field sensing using magnetic-fluid-filled optofluidic ring resonator10.1007/s10404-017-1994-4 ↗
8. All-optical tuning of a magnetic-fluid-filled optofluidic ring resonator10.1039/C4LC00236A ↗
9. Experimental investigation on convective heat transfer and hydrodynamic characteristics of magnetite nanofluid under the influence of an alternating magnetic field10.1016/j.ijthermalsci.2015.08.008 ↗
10. Enhancement in heat transfer of a ferrofluid in a differentially heated square cavity through the use of permanent magnets10.1016/j.jmmm.2017.07.062 ↗
11. Numerical investigation on yielding phenomena of magnetorheological fluid flowing through microchannel governed by transverse magnetic field10.1063/1.5079624 ↗
12. Magnetoviscosity of dilute magnetic fluids in oscillating and rotating magnetic fields10.1063/1.3370119 ↗
13. R.E. Rosensweig, Buoyancy and stable levitation of a magnetic body immersed in a magnetizable fluid, Nature 210(5036) (1966) 613.10.1038/210613a0 ↗
14. Rosensweig · AIAA J. · 1966 · 4 · p. 1751-+10.2514/3.3773 ↗
15. Magnetic actuator with ferrofluid and non-magnetic disc10.3233/JAE-2010-1083 ↗
16. A novel double-action actuator based on ferrofluid and permanent magnets10.1177/1045389X12449916 ↗
17. Study of the magnetic force delivered by an actuator with nonlinear ferrofluid and permanent magnets10.1002/tee.22331 ↗
18. Research on a novel ferrofluid inertial sensor with levitating nonmagnetic rod10.1109/JSEN.2015.2490253 ↗
19. The theoretical and experimental study of a novel two-dimensional magnetic fluid accelerometer
20. A ferrofluid based artificial tactile sensor with magnetic field control10.1016/j.jmmm.2016.09.105 ↗
21. The force on an object passing through a magnetic fluid seal10.1016/S0304-8853(02)00670-4 ↗
22. A method for magnetic field determination inside magnetic fluids10.1016/S0304-8853(99)00018-9 ↗
23. Vibration energy harvester with low resonant frequency based on flexible coil and liquid spring10.1063/1.4967498 ↗
24. Design and analysis of a plane vibration-based electromagnetic generator using a magnetic spring and ferrofluid10.3938/jkps.67.818 ↗
25. Electromagnetic human motion generator with magnetic spring and ferrofluid10.1049/el.2015.2696 ↗
26. An electromagnetic wearable 3-DoF resonance human body motion energy harvester using ferrofluid as a lubricant10.1016/j.apenergy.2017.04.006 ↗
27. Inductive tilt sensor with magnets and magnetic fluid10.1016/j.sna.2005.01.015 ↗
28. The research and development of inclination angle magnetic fluid detector with a movable sensing element based on permanent magnets10.1016/j.jmmm.2016.11.040 ↗
29. Magnetic fluid based high precision temperature sensor10.1109/JSEN.2017.2675440 ↗
30. A stepping micromotor based on ferrofluid bearing for side-viewing microendoscope applications10.1016/j.sna.2017.11.020 ↗
31. Electromagnetic microactuator realized by ferrofluid-assisted levitation mechanism10.1109/JMEMS.2014.2305112 ↗
32. Catheter-based microrotary motor enabled by ferrofluid for microendoscope applications10.1109/JMEMS.2016.2551222 ↗
33. Load and stiffness of a planar ferrofluid pocket bearing
34. Study on the ferrofluid lubrication with an external magnetic field10.1007/s11249-010-9693-2 ↗
35. Study on static supporting capacity and tribological performance of ferrofluids10.1080/10402000902913337 ↗
36. Hydrodynamic journal bearing lubricated with a ferrofluid10.1108/ILT-08-2016-0179 ↗
37. Damping properties for vibration suppression in electrohydraulic servo-valve torque motor using magnetic fluid10.1063/1.4875029 ↗
38. Damping applications of ferrofluids: a review10.4283/JMAG.2017.22.1.109 ↗
39. High accuracy position adjustment and vibration isolation actuator with the controlled ferrofluid10.1063/1.5012975 ↗
40. Study of the second-order levitation force in the magnetic fluid accelerometer10.1109/JSEN.2015.2464686 ↗
41. Magnetomechanical modeling of magnet immersed in magnetic fluid and controllability of self-suspension10.7498/aps.58.2005 ↗
42. Levitation of magnets and paramagnetic bodies in vessels filled with magnetic fluid10.1023/A:1019698205112 ↗
43. Movement of a magnet and a paramagnetic body inside a vessel with a magnetic fluid10.1016/S0304-8853(02)01089-2 ↗
44. A novel method for calculating and measuring the second-order buoyancy experienced by a magnet immersed in magnetic fluid10.1088/1361-6463/aa98b3 ↗
45. Effective and practical methods to calculate the second-order buoyancy in magnetic fluid acceleration sensor10.1109/JSEN.2018.2793944 ↗
46. Boundary interface condition of magnetic fluid determines the magnetic levitation force experienced by a permanent magnet suspended in the magnetic fluid10.1063/1.5041801 ↗
47. Experimental error analysis of measuring the magnetic self-levitation force experienced by a permanent magnet suspended in magnetic fluid with a nonmagnetic rod10.1016/j.jmmm.2018.08.080 ↗
48. R.E. Rosensweig, Ferrohydrodynamics. Cambridge University, New York, 1997, p. 33-73.
49. Research on the magnetic fluid levitation force received by a permanent magnet suspended in magnetic fluid: consideration a surface instability10.1016/j.jmmm.2019.165678 ↗