Rheological properties of magnetic fluids with the formation of clusters: Analysis of simple shear flow in a strong magnetic field

Kamiyama, Satoshi; Satoh, Akira

doi:10.1016/0021-9797(89)90018-0

Cited by 21 publications

(11 citation statements)

References 10 publications

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“…Finally, high field gradients eventually lead to irreversible agglomeration of nanoparticles within the ferrofluid, further deteriorating pumping performance. [11][12][13][14][15] In this work, we experimentally demonstrate for the first time a general approach that allows direct body pumping of ferrofluids at controllable speeds in closed-loop geometries at all scales without any moving parts. This ferrohydrodynamic pumping concept, as we earlier proposed theoretically, 16,17 relies on spatially traveling, sinusoidally time-varying magnetic fields created via electrodes near a given flow channel.…”

Section: Introductionmentioning

confidence: 96%

Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields

Mao

Elborai

et al. 2011

Phys. Rev. B

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Ferrofluid-based liquid manipulation schemes typically actuate an immiscible liquid via a ferrofluid plug, using high (~1 T) magnetic flux densities and strong field gradients created with bulky permanent magnets. They rely on surface tension effects to maintain the cohesion of the ferrofluid plug, necessitating miniature channels and slow (~1 microliter/minute) flow speeds. Here, we demonstrate direct ferrohydrodynamic pumping using traveling magnetic fields at controllable speeds in a simple, closed-loop geometry without any mechanically actuated components. The pumping approach is compact, scalable and practical. Using moderate field amplitudes (~10 mT), we obtained a maximum volumetric flow rate of 0.69 ml/s using a readily available commercial ferrofluid. Our closed-loop pumping approach could lead to integrated and efficient liquid manipulation and cooling schemes based on ferrofluids.3

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Section: Introductionmentioning

confidence: 96%

Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields

Mao

Elborai

et al. 2011

Phys. Rev. B

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“…The behavior of magnetic fluid varies with the magnetic field [12][13][14][15]. When a magnetic field is not applied, the behavior of magnetic fluid is similar to that of general fluid.…”

Section: Theorymentioning

confidence: 98%

Flow response of magnetic fluid surface by pitching motion

2010

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This research analyses the dynamic behavior of magnetic fluid that sloshes due to the pitching motion of the container. To analyze the behavior of magnetic fluid, we first analyze the equations that govern magnetic fluid as well as the momentum equation of the sloshing that results from a magnetic field. In each case, we conducted simulation and compared the results from simulation with those from experiments. When sloshing does not occur, the surface of the magnetic fluid rises towards the location of intensity of the magnetic field; in the absence of an additional, external body force, the fluid remains elevated. In case sloshing occurs simultaneously with the application of the magnetic field, the elevation of the surface as a result of the magnetic field is maintained. Further, we can confirm that if the excitation frequency of sloshing is small, the wave motion of the surface is small because the magnetic body force dominates the effect of sloshing. Even if the excitation frequency increases, the wave motion of the fluid surface is smaller than when a magnetic field is not applied. The fluid surface rises in that location where the intensity of the magnetic field is strong. Where the intensity of the magnetic field is weak, the height of the fluid surface is lower than the initial level that obtains in the absence of a magnetic field. Through the study, we can conclude that the sloshing behavior of magnetic fluid is influenced by the magnetic field intensity and distribution.

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“…It is evident that the value (19) has the meaning of dimensionless root-mean-square magnetic moment of the chain composed of n particles.…”

Section: Configuration Integral Of a Chain In A Weak Magnetic Fieldmentioning

confidence: 99%

“…A large volume of experimental data is available that demonstrates not only the existence of chain aggregates in ferrofluids, but also their significant influence on optical [12][13][14][15], rheological [16][17][18], and other physicochemical [19][20][21][22] properties of ferrofluids. The condensation of ferroparticles known as a phase separation was also repeatedly observed in experiments [23,24].…”

Section: Introductionmentioning

confidence: 99%

Initial magnetic susceptibility of ferrocolloids: The influence of chain aggregates

Иванов¹

2004

Colloid J

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The behavior of a system of noninteracting chain aggregates of ferroparticles suspended in a liquid matrix and subjected to a weak uniform permanent magnetic field was studied based on the free energy functional of a monodisperse low-concentration magnetic colloid. The orientational response of a flexible chain to a weak external field showed that the model of rigid rods is applicable only for short chains (doublets and triplets) of large ferroparticles characterized by a strong magnetodipole interaction. The calculated values of the initial magnetic susceptibility of aggregated ferrofluid agree well with the computer simulation data.

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Rheological properties of magnetic fluids with the formation of clusters: Analysis of simple shear flow in a strong magnetic field

Cited by 21 publications

References 10 publications

Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields

Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields

Flow response of magnetic fluid surface by pitching motion

Initial magnetic susceptibility of ferrocolloids: The influence of chain aggregates

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