Journal ArticleDOI
Natural convection heat transfer in a cavity filled with electrically conducting nano-particle suspension in the presence of magnetic field
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In this article, the effect of uniform magnetic field on the heat transfer behavior in the natural convection of electrically conducting but non-magnetic nano-particle suspensions was investigated.Abstract:
This work reports the effect of uniform magnetic field on the heat transfer behavior in the natural convection of electrically conducting but non-magnetic nano-particle suspensions. The experiments are carried out in a differentially heated cubical cavity with two opposite vertical faces at a different uniform temperature kept in a uniform magnetic field. The Rayleigh number range for the present experiment is between 1 × 106 and 1 × 107. To investigate the effect of volume fraction and the type of nanofluid, three different volume fractions of multi-wall carbon nanotubes, graphene, copper, and silica nanofluid are tested at different strengths and directions of the magnetic field. The presence of magnetic field deteriorates the heat transfer which depends upon the direction, strength of the magnetic field and type, and volume fraction of the nanofluid used. The role of magnetic field in the suppression of heat transfer in the presence of magnetic field is explained by a theory involving the interaction of moving electrically conducting particles with the uniform magnetic field.This work reports the effect of uniform magnetic field on the heat transfer behavior in the natural convection of electrically conducting but non-magnetic nano-particle suspensions. The experiments are carried out in a differentially heated cubical cavity with two opposite vertical faces at a different uniform temperature kept in a uniform magnetic field. The Rayleigh number range for the present experiment is between 1 × 106 and 1 × 107. To investigate the effect of volume fraction and the type of nanofluid, three different volume fractions of multi-wall carbon nanotubes, graphene, copper, and silica nanofluid are tested at different strengths and directions of the magnetic field. The presence of magnetic field deteriorates the heat transfer which depends upon the direction, strength of the magnetic field and type, and volume fraction of the nanofluid used. The role of magnetic field in the suppression of heat transfer in the presence of magnetic field is explained by a theory involving the interaction o...read more
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Effects of uniform magnetic induction on heat transfer performance of aqueous hybrid ferrofluid in a rectangular cavity
TL;DR: In this article, aqueous hybrid ferrofluids (AHF) were measured for volume concentrations of 0.05-0.3vol% and temperatures of 20-40°C.
Journal ArticleDOI
Experimental investigation into heat transfer performance of water-based magnetic hybrid nanofluids in a rectangular cavity exposed to magnetic excitation
TL;DR: In this article, the effect of magnetic excitation and hybrid nanofluid on the thermo-convection characteristics in enclosures was investigated and the results showed that without magnetic excitations, the average Nusselt number (Nuav) were observed to augment as Rayleigh number (Ra) and ΔT increased.
Journal ArticleDOI
Experimental Research and Development on the Natural Convection of Suspensions of Nanoparticles—A Comprehensive Review
TL;DR: Experimental research on the natural convection heat transfer performances of nanofluids in different geometries from thermal management and conversion perspectives is presented and it is demonstrated that there has been a lack of accurate stability evaluation given the inconsistencies of available results.
Journal ArticleDOI
On the selection of perturbations for thermal boundary layer control
TL;DR: In this paper, the authors investigated the convective instability of the thermal boundary layers of air in the laminar-to-turbulent transition regime (Ra = 8.7 × 107-1.1 × 109) by stability analysis in the framework of direct numerical simulations.
Journal ArticleDOI
Effect of uniform external magnetic-field on natural convection heat transfer in a cubical cavity filled with magnetic nano-dispersion
TL;DR: In this article, the effect of external uniform magnetic field on natural convection heat transfer in magnetite and iron nano-dispersion in a differentially heated cubical cavity was investigated.
References
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Journal ArticleDOI
Electrical conductivity of compacts of graphene, multi-wall carbon nanotubes, carbon black, and graphite powder
TL;DR: In this article, the electrical conductivity of different carbon materials (multi-walled carbon nanotubes, graphene, carbon black and graphite), widely used as fillers in polymeric matrices, was studied using compacts produced by a paper preparation process and by powder compression.
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Magnetic field effect on natural convection in a nanofluid-filled square enclosure
TL;DR: In this paper, the authors examined the natural convection in an enclosure that is filled with a water-Al2O3 nanofluid and is influenced by a magnetic field, based upon numerical predictions, the effects of pertinent parameters such as the Rayleigh number (103,≤,Ra,≤ 107), the solid volume fraction (0.06), and the Hartmann number ( 0.1), on the flow and temperature fields and the heat transfer performance of the enclosure were examined.
Journal ArticleDOI
Formulation of nanofluids for natural convective heat transfer applications
Dongsheng Wen,Yulong Ding +1 more
TL;DR: In this article, aqueous-based nanofluids are formulated in such a way that they are found very stable and are used to investigate their heat transfer behavior under the natural convection conditions.
Journal ArticleDOI
Electrical Properties of Carbon Nanotube Based Fibers and Their Future Use in Electrical Wiring
TL;DR: In this article, the potential of using carbon nanotube fibers as next generation wiring, state of the art developments in this field, and goals to be achieved before carbon Nanotubes may be transformed into competitive products.
Journal ArticleDOI
Determination of Critical Micelle Concentration Values Using Capillary Electrophoresis Instrumentation
TL;DR: In this paper, the authors demonstrate the usefulness of capillary electrophoresis (CE) instrumentation for determining values of critical micelle concentration (cmc) of surfactants.