Simulation and control scheme of microstructure in magnetic fluids

Li, Qiang; Xuan, Yimin; Li, Bin

doi:10.1007/s11431-007-0037-x

Cited by 17 publications

(7 citation statements)

References 10 publications

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“…The viscosity value of the nanofluids in our experiment was nearly close to the base fluid especially at a higher temperature. The higher viscosity of nanofluids may suppress flow turbulence [24]. Furthermore, the nanofluids with homogeneous and stable property may be also a critical factor to this result.…”

Section: Resultsmentioning

confidence: 99%

Nanofluids Containing γ-Fe2O3 Nanoparticles and Their Heat Transfer Enhancements

Shou-zhu

Jiang

et al. 2010

Nanoscale Res Lett

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Homogeneous and stable magnetic nanofluids containing γ-Fe2O3 nanoparticles were prepared using a two-step method, and their thermal transport properties were investigated. Thermal conductivities of the nanofluids were measured to be higher than that of base fluid, and the enhanced values increase with the volume fraction of the nanoparticles. Viscosity measurements showed that the nanofluids demonstrated Newtonian behavior and the viscosity of the nanofluids depended strongly on the tested temperatures and the nanoparticles loadings. Convective heat transfer coefficients tested in a laminar flow showed that the coefficients increased with the augment of Reynolds number and the volume fraction.

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Section: Resultsmentioning

confidence: 99%

Nanofluids Containing γ-Fe2O3 Nanoparticles and Their Heat Transfer Enhancements

Shou-zhu

Jiang

et al. 2010

Nanoscale Res Lett

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“…The FTIR curves of PFPE-acid and Fe 3 O 4 nanoparticles coated with PFPE-acid were studied to gain insight into the coated effect of particles. Figure 5A shows that the peak located at 563.1 cm −1 can be attributed to the Fe-O bond vibrations in Fe 3 O 4 (Li et al, 2007). Also, the peaks centered at 1,238.1, 1,134.0, 1,307.5, and 983.5 cm −1 confirm the existence of C-F, CF 2 , CF 3 , and C-O-C bonds, respectively (Ma et al, 2003).…”

Section: The Magnetism Of Nanoparticlesmentioning

confidence: 87%

Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid

et al. 2021

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It is well known that magnetic nanofluids are widely applied in various fields ranging from heat transfer to miniature cooling, and from damping to sealing, due to the mobility and magnetism under magnetic field. Herein, the PFPE-oil based magnetic nanofluids with superior magnetization and dispersion stability were obtained via regulating reaction temperature. The structures of particles were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The size effects of particles on the magnetism and coating effect of particles, and on the stability and saturation magnetization of the fluids were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM) and density instrument, respectively. The results indicate that the impurity phase FeOOH only appear in the sample prepared at 18°C and the average size of Fe3O4 nanoparticles reduces from 120 to 20 nm with raising reaction temperature. The saturation magnetization of Fe3O4 particles increases firstly and then reduces with increasing particle size, which is affected by the thickness of magnetic dead layer and impurity phase FeOOH. The Fe3O4 particles could be chemically coated by PFPE-acids, and the coated mass is a little affected by particle size. The stability of the nanofluids lowers while the saturation magnetization increases firstly and then decrease with increasing particle size. At reaction temperature of 60°C, Fe3O4 particles of 25 nm and the nanofluids with superior stability and saturation magnetization were obtained. Our results indicate that the control of nanoparticles size by regulating reaction temperature can be a useful strategy for preparing magnetic nanofluids with desirable properties for various potential applications.

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“…This means that a new correlation for nanofluids must be developed. Recently, Li and Xuan proposed a new correlation for the convection heat transfer coefficient of nanofluids as [17]:…”

Section: Discussionmentioning

confidence: 99%

Effect of alumina nanoparticles in the fluid on heat transfer in double-pipe heat exchanger system

Chun¹,

Kang²,

Kim

2008

Korean J. Chem. Eng.

114

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This study was performed to investigate the convective heat transfer coefficient of nanofluids made of several alumina nanoparticles and transformer oil which flow through a double pipe heat exchanger system in the laminar flow regime. The nanofluids exhibited a considerable increase of heat transfer coefficients. Although the thermal conductivity of alumina is not high, it is much higher than that of the base fluids. The nanofluids tested displayed good thermal properties. One of the possible reasons for the enhancement on heat transfer of nanofluids can be explained by the high concentration of nanoparticles in the thermal boundary layer at the wall side through the migration of nanoparticles. To understand the enhancement of heat transfer of nanofluid, an experimental correlation was proposed for an alumina-transformer oil nanofluid system.

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Simulation and control scheme of microstructure in magnetic fluids

Cited by 17 publications

References 10 publications

Nanofluids Containing γ-Fe2O3 Nanoparticles and Their Heat Transfer Enhancements

Nanofluids Containing γ-Fe2O3 Nanoparticles and Their Heat Transfer Enhancements

Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid

Effect of alumina nanoparticles in the fluid on heat transfer in double-pipe heat exchanger system

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