Experimental investigation for enhanced ferrofluid heat transfer under magnetic field effect

Lajvardi, M.; Moghimi‐Rad, Jafar; Hadi, Iraj; Gavili, Anwar; Isfahani, Taghi Dallali; Zabihi, Fatemeh; Sabbaghzadeh, J.

doi:10.1016/j.jmmm.2010.06.054

Cited by 267 publications

(74 citation statements)

References 33 publications

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“…In addition, these results could contribute as a basic research result applicable to heat exchangers like solar thermal collectors in real industries. As a result, the mean Nusselt numbers increased with the increase of magnetite volume fractions at all magnetic field intensities because of the combined effects of both heat conduction by magnetite and the magnetic volume force [23]. In addition, at H = 1000, 2000 and 3000 A/m, the mean Nusselt numbers at the magnetite volume fraction of 4.5% increased by 0.98%, 3.19% and 16.85%, respectively, compared with the water reduced convective heat transfer rate.…”

Section: Nusselt Numbers and Heat Transfer Characteristicsmentioning

confidence: 96%

Thermophysical Characteristics of the Ferrofluid in a Vertical Rectangle

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You

Kwen

et al. 2015

Entropy

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Abstract:The article aimed to analytically investigate the thermophysical behaviors of a ferrofluid in a vertical rectangle with the variation of intensity of the magnetic field, viscosity of the ferrofluid and boundary conditions. The governing equations of the ferrofluid include the continuity, momentum and energy equations for describing the thermal-fluidic behaviors of the ferrofluid and the Maxwell equation and magnetization equation are also added to consider rotating effect of the nano-sized particles. The flow behavior and heat transfer characteristics of the ferrofluid with the intensity of the magnetic field, viscosities of the ferrofluid and boundary conditions were analyzed through isotherms, velocity profiles and both mean and local Nusselt numbers. As a result, the isotherms of the ferrofluid in the vertical rectangle increased with the increase of the magnetic volume fractions and magnetic field intensities. In addition, the mean Nusselt numbers increased with the increase of magnetite volume fractions at all magnetic field intensities because of the combined effects of both heat conduction by magnetite and the magnetic volume force.

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Section: Nusselt Numbers and Heat Transfer Characteristicsmentioning

confidence: 96%

Thermophysical Characteristics of the Ferrofluid in a Vertical Rectangle

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Kwen

et al. 2015

Entropy

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“…For example, Fe NPs in base fluid were found to exhibit enhanced at applied , and studies with varying directions of applied indicated that this could be associated with a chain like structure formation involving field gradient parallel to thermal gradient, analogous to the anisotropic transport properties of magnetorheological fluids [7][8][9]. Similarly, Lajvardi et al [10] have reported that enhancement in convective heat transfer performance of 2 ISRN Nanotechnology Fe 3 O 4 based ferrofluid under the application of magnetic field.…”

Section: Introductionmentioning

confidence: 94%

“…Alignment (perpendicular, parallel) of sensor in the presence of external is shown in Figure 1. Thermal conductivity was measured using hot wire transient method with platinum wire (diameter = 30 × 10 −6 m) and data acquisition system DataTaker (DT 80) as a function of parallel applied [10]. In our experimental setup …”

Section: Measurement Of Thermal Effusivity and Conductivitymentioning

confidence: 99%

Experimental Investigation of Thermal Conductivity and Effusivity of Ferrite Based Nanofluids under Magnetic Field

Singh¹,

Raykar

2013

ISRN Nanotechnology

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We investigate the effect of magnetic field ( ) on the thermal conductivity ( ) and effusivity ( ) of cobalt ferrite based nanofluids having different concentrations ( ). Cobalt ferrite nanoparticles (NPs) have been synthesized using the microwave assisted method. At high volume fraction of cobalt ferrite nanoparticles in water ( > 0), both thermal parameters have been found to be suppressed relative to and of water in the absence of . However, it is seen that percentage values of the effusivity in perpendicular field direction show negative to positive variation, and thermal conductivity in parallel field direction shows negative to zero variation.

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“…The superparamagnetic nanoparticles (SNP) [1] are promising additives, whose stable dispersions in TO constitute ferrofluids with a potential application in electrical engineering. The intuitively enhanced cooling ability of the resulting ferrofluid originates primarily in the increased thermal conductivity due to the particles [2,3]. Moreover, in such a liquid coolant the effect of thermomagnetic convection has been observed when exposed to temperature and magnetic field gradients, which are inherently present around power transformers [4,5].…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of a Dielectric Relaxation in Weakly Polar Ferrofluids

et al. 2017

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In this paper, we report on the temperature dependent broadband dielectric response of a ferrofluid based on transformer oil and magnetite nanoparticles covered with oleic acid molecules. For that purpose the method of dielectric spectroscopy has been chosen in the frequency range from 20 Hz up to 100 kHz. The experiments were carried out on thin film ferrofluid samples confined in a glass plate capacitor containing indium tin oxide (ITO) plate electrodes. The obtained complex permittivity spectrum shows a pronounced dielectric dispersion in the low frequency range. Taking into account the ferrofluid composition we associate this relaxation with ion impurity polarization at the nanoparticle-oil interface. The strong temperature dependence of the relaxation process has been found when conducting the experiments in the temperature range from 298 K to 358 K. The relaxation time of the revealed process exhibits a typical Arrhenius behavior. Based on the conducted experiments and analysis, we propose some reasonable practical applications of the studied ferrofluid in the field of electrical engineering.

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Experimental investigation for enhanced ferrofluid heat transfer under magnetic field effect

Cited by 267 publications

References 33 publications

Thermophysical Characteristics of the Ferrofluid in a Vertical Rectangle

Thermophysical Characteristics of the Ferrofluid in a Vertical Rectangle

Experimental Investigation of Thermal Conductivity and Effusivity of Ferrite Based Nanofluids under Magnetic Field

Temperature Dependence of a Dielectric Relaxation in Weakly Polar Ferrofluids

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