Magnetic field dependent measurement techniques of surface tension of magnetic fluid at an air interface

Nair, Nishant; Virpura, Hiral; Patel, Rajesh

doi:10.1063/1.4918215

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…12 Indirectly, surface tension can be estimated by analyzing the spatial scale of this relief. 10,13,14 Another class of techniques is based on the analysis of the shape of a FF droplet suspended in a nonmagnetic liquid, or drop-like aggregates being a condensed phase of the surrounding FF. These droplets elongate in the external MF.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In this case, the effect of surface tension must be acquired from the data obtained against the background of the more pronounced magnetic sensitivity effect. This leads to interpretational ambiguity when utilizing conventional tensiometric methods. − Additional difficulties arise when the design of the tensiometer is modified to operate in MF.…”

Section: Introductionmentioning

confidence: 99%

“…In a transversely homogeneous MF this phenomenon results in the emergence of Rosensweig surface instability and the formation of a stationary topography . Indirectly, surface tension can be estimated by analyzing the spatial scale of this relief. ,, …”

Section: Introductionmentioning

confidence: 99%

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Does Magnetic Field Influence the Surface Tension of Ferrofluid?

Khokhryakova,

Shmyrov,

Mizeva

2024

Langmuir

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Studying the physical properties of ferrofluids is a challenging task, especially when conventional experimental techniques are adapted to the presence of a magnetic field. To date, there has been no definitive understanding of how the magnetic field affects the surface energy of ferrofluid interfaces. In this study, we perform a direct experimental investigation to assess the effect of magnetic fields on the surface tension of ferrofluids. For this purpose, a modified capillary wave technique was modified for use in the presence of an external magnetic field. A decrease in the wavelength of the capillary wave was observed when the magnetic field was oriented perpendicular to the ferrofluid surface, and an increase was recorded when the magnetic field was parallel. We note that the capillary wave pattern elongates along the magnetic field force lines. The observed effect is attributed to the varying influence of the magnetic field along and across the propagating capillary wave. Analysis of the dispersion relation and evaluation of the impacts of various mechanisms influencing capillary waves revealed, that the changes in the surface tension of ferrofluids in the presence of a magnetic field are responsible for the observed behavior. It is shown that the surface tension of the MK 8-40 ferrofluid gradually increases with the applied magnetic field and reaches a grouth up to 10% in a magnetic field of ∼10 kA/m. Thus, the surface tension is found to be influenced by an external magnetic field.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Does Magnetic Field Influence the Surface Tension of Ferrofluid?

Khokhryakova,

Shmyrov,

Mizeva

2024

Langmuir

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“…To overcome these problems, in this paper, we establish a semianalytical model of surface magnetic field measure ments for the detection of cracks with different hidden depths and shapes, although surface magnetic field measurement has been used in other applications [22,23]. By measuring the size of the total magnetic field on the surface of the object, the method avoids detecting only the eddy current field and can also detect cracks parallel to the eddy current.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of cracks with different hidden depths and shapes using surface magnetic field measurements based on semi-analytical modelling

Jiang

Liu

2018

J. Phys. D: Appl. Phys.

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In this paper, we present a feasibility study for detecting cracks with different hidden depths and shapes using information contained in the magnetic field excited by a rectangular coil with a rectangular cross section. First, we solve for the eigenvalues and the unknown coefficients of the magnetic vector potential by imposing artificial and natural boundary conditions. Thus, a semianalytical solution for the magnetic field distribution around the surface of a conducting plate that contains a long hidden crack is formulated. Next, based on the proposed modelling, the influences of the different hidden depth cracks on the surface magnetic field are analysed. The results show that the horizontal and vertical components of the magnetic field near the crack are becoming weaker and that the phase information of the magnetic field can be used to qualitatively determine the hidden depth of the crack. In addition, the model is optimised to improve its accuracy in classifying crack types. The relationship between signal features and crack shapes is subsequently established. The modified model is validated by using finite element simulations, visually indicating the change in the magnetic field near the crack.

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“…The difference between the actual magnetic field and the measured magnetic field (used in the calculations) becomes more significant at the high magnetic field. Second, the possible variation of the surface tension of ferrofluid droplet with the strength of the magnetic field is neglected [271,272]. In this work, the surface tension of ferrofluid is measured without inclusion of the magnetic field, because it is difficult to measure the surface tension under the magnetic lift and squeeze conditions.…”

mentioning

confidence: 99%

Experimental and numerical studies on freezing of droplets under effects of nanoparticles and magnetic fields

Zhang¹

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Magnetic field dependent measurement techniques of surface tension of magnetic fluid at an air interface

Cited by 8 publications

References 1 publication

Does Magnetic Field Influence the Surface Tension of Ferrofluid?

Does Magnetic Field Influence the Surface Tension of Ferrofluid?

Evaluation of cracks with different hidden depths and shapes using surface magnetic field measurements based on semi-analytical modelling

Experimental and numerical studies on freezing of droplets under effects of nanoparticles and magnetic fields

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