Effects of Nano Copper Additive on Thermal Conductivity of Magnetorheological Fluid at Different Environment Temperature

Rahim, M S A; Ismail, Izwan; Aqida, S. N.

doi:10.4028/www.scientific.net/msf.890.108

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…The More specifically, the most prominent increase has been from MRF with Cu samples from 35 to 40 vol% of CIP concentration, resulted from 0.674 W m −1 K −1 to 0.902 W m −1 K −1 . This behaviour was partly due to heat transfer in the micro system dominated by conduction behaviour between CIP particles [32]. Though the concentration difference of CIP is only 5 vol% between them, the concentration of Cu differs from the samples and thus provided contribution to this enhancement.…”

Section: Resultsmentioning

confidence: 99%

Thermal conductivity enhancement and sedimentation reduction of magnetorheological fluids with nano-sized Cu and Al additives

Rahim¹,

Ismail²,

Choi³

et al. 2017

Smart Mater. Struct.

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This work presents enhanced material characteristics of smart magnetorheological (MR) fluids by utilizing nano-sized metal particles. Especially, enhancement of thermal conductivity and reduction of sedimentation rate of MR fluids those are crucial properties for applications of MR fluids are focussed. In order to achieve this goal, a series of MR fluid samples are prepared using carbonyl iron particles (CIP) and hydraulic oil, and adding nano-sized particles of copper (Cu), aluminium (Al), and fumed silica (SiO2). Subsequently, the thermal conductivity is measured by the thermal property analyser and the sedimentation of MR fluids is measured using glass tubes without any excitation for a long time. The measured thermal conductivity is then compared with theoretical models such as Maxwell model at various CIP concentrations. In addition, in order to show the effectiveness of MR fluids synthesized in this work, the thermal conductivity of MRF-132DG which is commercially available is measured and compared with those of the prepared samples. It is observed that the thermal conductivity of the samples is much better than MRF-132DG showing the 148% increment with 40 vol% of the magnetic particles. It is also observed that the sedimentation rate of the prepared MR fluid samples is less than that of MRF-132DG showing 9% reduction with 40 vol% of the magnetic particles. The mixture optimized sample with high conductivity and low sedimentation was also obtained. The magnetization of the sample recorded an enhancement of 70.5% when compared to MRF-132DG. Furthermore, the shear yield stress of the sample were also increased with and without the influence of magnetic field.

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Section: Resultsmentioning

confidence: 99%

Thermal conductivity enhancement and sedimentation reduction of magnetorheological fluids with nano-sized Cu and Al additives

Rahim¹,

Ismail²,

Choi³

et al. 2017

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…The values for the magnetizable beads are chosen for iron carbonyl powder. We assume a density of ρ m = 7800 kg m −3 [48], a thermal conductivity of λ m = 80.4 W m −1 K −1 [53], and a specific heat capacity of c m = 460 J kg −1 K −1 [39]. This leads to thermal diffusivities of a silicone = 1.6495 × 10 −7 m 2 s −1 and a m = 2.2408 × 10 −5 m 2 s −1 , respectively.…”

Section: Evaluation Of the Thermal Conductivitymentioning

confidence: 99%

Variations in the thermal conductivity of magnetosensitive elastomers by magnetically induced internal restructuring

Jäger

Fischer

Lutz

et al. 2022

J. Phys.: Condens. Matter

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Magnetosensitive elastomers respond to external magnetic fields by changing their stiffness and shape. These effects result from interactions among magnetized inclusions that are embedded within an elastic matrix. Strong external magnetic fields induce internal restructuring, for example the formation of chain-like aggregates. However, such reconfigurations affect not only the overall mechanical properties of the elastomers but also the transport through such systems. We concentrate here on the transport of heat, that is thermal conductivity. For flat, thin model systems representing thin films or membranes and modeled by bead-spring discretizations, we evaluate the internal restructuring in response to magnetization of the particles. For each resulting configuration, we evaluate the associated thermal conductivity. We analyze the changes in heat transport as a function of the strength of magnetization, particle number, density of magnetizable particles (at fixed overall particle number), and aspect ratio of the system. We observe that varying any one of these parameters can induce pronounced changes in the bulk thermal conductivity. Our results motivate future experimental and theoretical studies of systems with magnetically tunable thermal but also electric conductivity---both of which have only rarely been addressed so far.

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Recent advances in the effective removal of hazardous pollutants from wastewater by using nanomaterials—A review

Chahar

Khaturia

Singh

et al. 2023

Front. Environ. Sci.

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Environmental nanotechnology has developed rapidly over the past few decades due to the fast advancement of nanotechnology and nanomaterials (NMs). Due to their nanoscale size, NMs are receiving immense attention in research and development worldwide. Their nano size has led to better catalysis, high reactivity, and high adsorption capacity. In wastewater treatment, nanotechnology has significant potential to improve the performance and efficiency of water decontamination; more effectively, it provides a sustainable way to keep water supplies safe. Numerous studies have found that removing harmful components from wastewater by employing nanoparticles in conjunction with various treatment methods is effective. The purpose of the current investigation is to conduct a review of the envisioned applications of various NMs in the treatment of wastewater. These NMs include carbonaceous NMs, metal-containing nanoparticles, and nanocomposites, all of which will be reviewed and highlighted in depth.

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Effects of Nano Copper Additive on Thermal Conductivity of Magnetorheological Fluid at Different Environment Temperature

Cited by 3 publications

References 11 publications

Thermal conductivity enhancement and sedimentation reduction of magnetorheological fluids with nano-sized Cu and Al additives

Thermal conductivity enhancement and sedimentation reduction of magnetorheological fluids with nano-sized Cu and Al additives

Variations in the thermal conductivity of magnetosensitive elastomers by magnetically induced internal restructuring

Recent advances in the effective removal of hazardous pollutants from wastewater by using nanomaterials—A review

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