Experimental Study of Surface Tension Coefficient for Magnetic Fluid

Wang, Qing Lei; Li, De Cai; Wang, Fan

doi:10.4028/www.scientific.net/kem.492.277

Cited by 2 publications

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“…In the continuous surface force model proposed by Brackbill [31], the surface tension is interpreted as a continuous three-dimensional effect acrossing the interface. The effect of surface tension is simulated by the addition of a source term to the momentum equation.…”

Section: Establishment Of Polishing Pad Surface Micro-profile Modelmentioning

confidence: 99%

Modeling of solid–liquid coupling and material removal in robotic wet polishing

Pan

Chen

Jin

et al. 2023

Int J Adv Manuf Technol

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In this paper, the flow characteristics of the polishing fluid between the polishing pad and the workpiece are studied for the robotic wet polishing process, and the distribution of the polishing fluid radial velocity Ur and the liquid film thickness z at different rotating radii r are revealed. The two-dimensional computational domain consisting of the polishing pad surface, the workpiece wall and the polishing fluid is established. The particle-liquid two-phase flow simulation is carried out in Fluent, and the influence of different rotation rate ω of the polishing pad and different robot swing speeds v2 on the change and distribution of polishing fluid flow rate and temperature are elaborated. The position distribution of the abrasive particles in the wet polishing process and the velocity distribution of particles in the x and y directions impacting on the workpiece surface are simulated and analyzed for polishing fluids with different average abrasive diameters dp. The three-dimensional calculation domain for wet polishing is established; the workpiece surface erosion is simulated in Fluent; the material removal rate MRR and standard deviation of material removal σ on the workpiece surface are calculated considering different combinations of polishing fluid properties Ci and polishing kinematics Pi. Under the same process parameters, the material removal rate test value MRRT and the standard deviation of material removal test value σT are compared with the simulated values, respectively. The results show that under the combination of 64 groups of physical parameters C1-C64 of the polishing fluid, the error between the test value MRRT, σT and the simulationvalue MRR, σ is within 5%. With 64 sets of polishing kinematics parameters P1-P64, the average error between the test value MRRT and the simulated value MRR is 4.19%. However, when the polishing pad rotation rate ω is high, there is an inefficient polishing area in the smaller radius from the polishing pad rotation center, which results in a lower MRRT in some tests than that in simulation, with an maximum error of 8.1%. The average error between the test value σT and the simulation value σ is 3.77%. When the pressure P of the polishing pad is high, the large particles embedded in the polishing pad surface follow its rotation, causing deep scratches on the workpiece surface, which results in a larger σT in some tests, with an maximum error of 7.8%. In conclusion, the material removal principle and the influence of different process parameters in the robotic wet polishing process are revealed in this paper.through modeling and simulation of the particle-liquid two-phase flow, giving an accurate estimation of the material removal rate of the robotic wet polishing process.

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Section: Establishment Of Polishing Pad Surface Micro-profile Modelmentioning

confidence: 99%

Modeling of solid–liquid coupling and material removal in robotic wet polishing

Pan

Chen

Jin

et al. 2023

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…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%

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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Experimental Study of Surface Tension Coefficient for Magnetic Fluid

Cited by 2 publications

References 0 publications

Modeling of solid–liquid coupling and material removal in robotic wet polishing

Modeling of solid–liquid coupling and material removal in robotic wet polishing

Does Magnetic Field Influence the Surface Tension of Ferrofluid?

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