Research on the magnetic fluid levitation force received by a permanent magnet suspended in magnetic fluid: Consideration a surface instability

Yu, Jun; Chen, Duo; Cai, Zhenyu; Li, Decai; Cao, Qianhui; Qian, Leping

doi:10.1016/j.jmmm.2019.165678

Cited by 19 publications

(6 citation statements)

References 39 publications

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“…Ferrofluid inertia dampers based on levitation characteristics have compact structures and are sensitive to inertial forces; thus, they can potentially be used to reduce vibrations in spacecraft. Through many theoretical and experimental studies on the levitation force [112,113], it is hoped that the performance of ferrofluid inertia dampers can be improved. In addition, a large proportion of vibration energy harvesters are based on levitation characteristics.…”

Section: Ferrofluid Inertia Dampersmentioning

confidence: 99%

“…In 1965, Stephen [1] from National Aeronautics and Space Administration (NASA) successfully prepared stable ferrofluids for the first time, after which many of the properties of ferrofluids were investigated, including their levitation characteristics [2,3], rheological properties [4,5], magnetization characteristics [6], magnetoviscous effect [7,8], magnetocaloric effect [9,10], and magneto-optic effect [11,12]. Ferrofluids have a wide range of industrial applications such as seals [13][14][15], dampers, sensors [16,17], lubrication [18][19][20], biomedicine [21], and finishing [22,23].…”

Section: Introductionmentioning

confidence: 99%

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Typical dampers and energy harvesters based on characteristics of ferrofluids

Han

et al. 2022

Friction

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Ferrofluids are a type of nanometer-scale functional material with fluidity and superparamagnetism. They are composed of ferromagnetic particles, surfactants, and base liquids. The main characteristics of ferrofluids include magnetization, the magnetoviscous effect, and levitation characteristics. There are many mature commercial ferrofluid damping applications based on these characteristics that are widely used in numerous fields. Furthermore, some ferrofluid damping studies such as those related to vibration energy harvesters and biomedical devices are still in the laboratory stage. This review paper summarizes typical ferrofluid dampers and energy harvesting systems from the 1960s to the present, including ferrofluid viscous dampers, ferrofluid inertia dampers, tuned magnetic fluid dampers (TMFDs), and vibration energy harvesters. In particular, it focuses on TMFDs and vibration energy harvesters because they have been the hottest research topics in the ferrofluid damping field in recent years. This review also proposes a novel magnetic fluid damper that achieves energy conversion and improves the efficiency of vibration attenuation. Finally, we discuss the potential challenges and development of ferrofluid damping in future research.

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Section: Ferrofluid Inertia Dampersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Typical dampers and energy harvesters based on characteristics of ferrofluids

Han

et al. 2022

Friction

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“…Magnetic fluids can exhibit both the fluidity of liquids and magnetic properties under an external magnetic field. Hence, magnetic fluids have always received extensive attention and become a research hotspot and have a wide variety of applications because of their fluidity and magnetism (Batter et al, 2013;Cui et al, 2015), including sealing (Li et al, 2017;Marcin, 2018;Szczech, 2020), lubrication (Shahrivar and de Vicente, 2014), sensors (Yao et al, 2015;Yu et al, 2018;Yu et al, 2019), biomedicine (Hensley et al, 2017;Metelkina et al, 2017), and so on. In particular, magnetic fluid sealing is one of the advanced applications of magnetic fluids.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Fatty Acids as Surfactants on the Rheological Properties of Kerosene-Based Magnetic Fluids

Zang

Wang

et al. 2022

Front. Mater.

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Three types of surfactants (oleic acid, linoleic acid, and a mixture of oleic acid and linoleic acid) were coated on ferromagnetic particles, which were dispersed in kerosene to prepare magnetic fluids, to study the effect of different fatty acids as surfactants on the rheological properties of magnetic fluids. The particles were analyzed by XRD, TEM, FT-IR, and VSM. Furthermore, a rheometer was used to examine the rheological properties of kerosene-based magnetic fluids dispersed with various surfactants. The yield stress at different magnetic fields was calculated by fitting the Herschel–Bulkley model. The fitted curve and the observed values of mixed fatty acids are identical. The graphs of viscosity increase with the shear rate for each magnetic fluid were measured at constant magnetic field strengths. At constant shear rates, the curves of viscosity increase with magnetic field intensity were measured. In the absence of a magnetic field, the relative change in viscosity from 40°C to 0°C was observed. The rheological measurements of the mixed fatty acid-dispersed ferrofluid with a rising magnetic field at a constant shear rate are smoother than the single-fatty-acid-dispersed ferrofluid, indicating that it is more stable. As the temperature is dropped, the viscosity–temperature curve evidence that mixed fatty acids as surfactants can lower the proportion of magnetic fluid viscosity rise.

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“…It is somewhat worth mentioning that the early stage SOB force measurement technique was based on the tensile force of the rope attached to the top of the magnet within the ferrofluid [22]. A series of scientific reports published by Yu and some other authors were dedicated to extensive theoretical consideration of SOB, but the experimental setup was still based on the Dynamometer and Vernier caliper [8,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Contactless Determination of a Permanent Magnet’s Stable Position within Ferrofluid

et al. 2022

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The paper deals with the contactless detection of a rod permanent magnet’s position within a ferrofluid. The working principle of the proposed approach is grounded on the solenoidal nature of the field lines. For the line detection technique analyzed in this article, where the magnetic field is scanned along the line parallel to the magnet’s axial direction, the center of the magnet corresponds to the point on the line where the radial component of the magnetic field vanished. The concept introduced here was evaluated numerically, where the results showed a promising perspective for the technique to be employed in practice. In contrast to the X-ray or Vernier-caliper-based technique, the one proposed here is somewhat more suitable for employment in applications where simplicity and robustness are of vital importance.

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Research on the magnetic fluid levitation force received by a permanent magnet suspended in magnetic fluid: Consideration a surface instability

Cited by 19 publications

References 39 publications

Typical dampers and energy harvesters based on characteristics of ferrofluids

Typical dampers and energy harvesters based on characteristics of ferrofluids

Effects of Different Fatty Acids as Surfactants on the Rheological Properties of Kerosene-Based Magnetic Fluids

Contactless Determination of a Permanent Magnet’s Stable Position within Ferrofluid

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