Magnetic and ultrasonic studies on stable cobalt ferrite magnetic nanofluid

Rashin, M. Nabeel; Hemalatha, J.

doi:10.1016/j.ultras.2013.10.009

Cited by 36 publications

(4 citation statements)

References 36 publications

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“…MR fluids are having a huge potential in industrial application such as brakes, clutches, dampers, prosthetic knee, vibration tool chatter reduction, biomedical applications such as cell treatment devices and pharmacy delivery systems. Typically, increasing the particle size and concentration of the particle increases the performance of the MR system but it is also illustrated by several researchers that increasing temperature decreases the yield stress which reduces the performance of the MR system [17,18,[28][29][30][31][32][33][34][35][36][37][38][39]. The performance of an MR fluid can be enhanced by improving the properties of MR fluid such as shape of the particle, size of the particle, base viscosity, additive percentage, particle concentration etc the criticality of MR fluid property enhancement for better performance lies in its compromising effect between the properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of reduced geometric dimensions on torque generation in two plate rotor magnetorheological brake with in-house magnetorheological fluid

K¹,

Kadam²,

Kumar³

et al. 2023

Smart Mater. Struct.

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The present study is aimed to evaluate the torque generation capacity of a two plate rotor magnetorheological (MR) brake using in-house prepared MR fluid. The prepared MR fluids were studied for sedimentation rate at different temperatures and flow characterization at different currents and at specific temperatures. The yield stress of the fluid is explored through Herschel-Bulkley (HB) model. The results depict significant increase in sedimentation rate and decrease in yield stress with increase in temperature of the MR fluid. MR brake (model-1) is fabricated after finite element method magnetics (FEMM) exhibit magnetic field of approximately 0.145 T in the shear gap than other two models (model-2 and model-3) considered in this study. Characterization of the MR brake illustrates that there is an increase in torque with increasing current. Further tests have been carried out to identify the effect of sedimentation on torque generation at 52 °C after 15 hours of sedimentation. The results indicate 16 % reduction in the initial torque because of settling of particles. MR fluid and particles characterization illustrates that 322 °C and 400 °C are critical points in controlling the MR fluid input parameters.

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Section: Introductionmentioning

confidence: 99%

Effect of reduced geometric dimensions on torque generation in two plate rotor magnetorheological brake with in-house magnetorheological fluid

K¹,

Kadam²,

Kumar³

et al. 2023

Smart Mater. Struct.

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“…Nanosized particle dispersions inside the base fluids are called nanofluids. They have wide application in many fields which include oil sealing, hyperthermia, mobile separation and many others as their properties can be tuned with an addition of nanoparticles in the base fluid [1][2][3][4][5][6][7][8][9]. Magnetic nanofluids are those with properties which can be manipulated via the application of external magnetic field [10].…”

Section: Introductionmentioning

confidence: 99%

Magnetically tuned thermoelectric behavior of Zn-doped magnetite nanofluids

Kumari

Hemalatha

2020

Nanotechnology

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In the present work, magneto thermoelectric behavior of the Zn-doped magnetite nanofluids is reported. Thermal and electrical conductivity studies have been done, compared and determined to be in line with the theoretical models. Thermoelectric voltage measurements have been carried out in the fluid samples for quite a number of temperature differences at various magnetic fields, and the Seebeck coefficient is calculated from the obtained measurements. It is observed that the fluid samples, which includes magnetite nanoparticle with zinc dopant concentration x = 0.2 shows better enhancement in electrical conductivity, mild enhancement in thermal conductivity and higher Seebeck coefficient value among all the samples. Also, a higher enhancement of 26% is observed in the Seebeck coefficient value of the same sample with an application of 770 G magnetic field. Hence, this is identified as a potential candidate for energy harvesting purposes such as thermoelectric generators in automobile systems, industries and etc.

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“…In a study by Lopez et al [26], Co (1−x) Zn x Fe 2 O 4 nanoparticles were deposited using cobalt (II) chloride hexahydrate, iron (III) chloride hexahydrate, and zinc sulfate heptahydrate in NaOH water solution at 80 • C. These nanoparticles exhibited fine ferrite nanoparticle behavior in vibrating sample magnetometry and X-ray diffraction (XRD) and vibrating sample magnetometry (VSM) tests. Table 1 presents a summary of the magnetic nanofluid preparation [27][28][29][30][31][32][33][34][35][36][37][38]. Currently, a water-based Fe 3 O 4 nanofluid is widely used, but there has been hardly any research into alternatives.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Experimental Study on the Thermophysical Characteristics of DI Water Based Co0.5Zn0.5Fe2O4 Nanofluid for Solar Thermal Harvesting

2020

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The thermophysical properties of water-based Co0.5Zn0.5Fe2O4 magnetic nanofluid were investigated experimentally. Consequently, the viscosities of 0.25 wt% and 1 wt% Co0.5Zn0.5Fe2O4 nanofluid were 1.03 mPa∙s and 1.13 mPa∙s, each greater than that of the 20 °C base fluid (water), which were increased by 7.3% and 17.7%, respectively. The Co0.5Zn0.5Fe2O4 nanofluid thermal conductivity enhanced from 0.605 and 0.618 to 0.654 and 0.693 W/m·°C at concentrations of 0.25 wt% and 1 wt%, respectively, when the temperature increased from 20 to 50 °C. The maximum thermal conductivity of the Co0.5Zn0.5Fe2O4 nanofluid was 0.693 W/m·°C at a concentration of 1 wt% and a temperature of 50 °C. Furthermore, following a solar exposure of 120 min, the photothermal energy conversion efficiency of 0.25 wt%, 0.5 wt%, 0.75 wt%, and 1 wt% Co0.5Zn0.5Fe2O4 nanofluids increased by 4.8%, 5.6%, 7.1%, and 4.1%, respectively, more than that of water.

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Magnetic and ultrasonic studies on stable cobalt ferrite magnetic nanofluid

Cited by 36 publications

References 36 publications

Effect of reduced geometric dimensions on torque generation in two plate rotor magnetorheological brake with in-house magnetorheological fluid

Effect of reduced geometric dimensions on torque generation in two plate rotor magnetorheological brake with in-house magnetorheological fluid

Magnetically tuned thermoelectric behavior of Zn-doped magnetite nanofluids

Comprehensive Experimental Study on the Thermophysical Characteristics of DI Water Based Co0.5Zn0.5Fe2O4 Nanofluid for Solar Thermal Harvesting

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