Experimental investigation of heat transfer enhancement and viscosity change of hBN nanofluids

Ilhan, Beybin; Kurt, Melike; Ertürk, Hakan

doi:10.1016/j.expthermflusci.2016.04.024

Cited by 65 publications

(27 citation statements)

References 41 publications

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“…Using two-step method, the synthesis of BN nanofluids has been performed using DI water, ethylene glycol (EG), EG-DI water mixture (by volume 50%) and surfactants, such as, sodium dodecyl sulfate (SDS) and polyvinyl pyrrolidone (PVP). The highest thermal conductivity is obtained with particle volume concentration varying between 0.03% and 3% [13]. In addition, it is reported that dispersant may also affect the stability, viscosity and thermal conductivity enhancement.…”

Section: Introductionmentioning

confidence: 95%

Boron nitride (BN) nanofluids as cooling agent in thermal management system (TMS)

Krishnam

Bose

Das

2016

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 95%

Boron nitride (BN) nanofluids as cooling agent in thermal management system (TMS)

Krishnam

Bose

Das

2016

Applied Thermal Engineering

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“…Consequently, due to their discovered potential in a variety of applications incorporating heat transfer, such as heat exchangers, solar collectors, or thermal energy storage systems, the research in nanofluids has been intensified over the past years [2][3][4][5][6]. For the base fluids water and ethylene glycol are commonly used in both, the experimental [5,[7][8][9][10][11][12][13][14] and the numerical studies [4,[15][16][17]. The numerical investigation has been directed towards two main different approaches by modeling the nanofluid flow either as an effective single-phase mixture with unique properties depending on the nanoparticle volume fraction, or a two-phase flow with explicitly accounting for the interaction of the nanoparticles with the base fluid [18].…”

Section: Introductionmentioning

confidence: 99%

“…The materials of nanoparticles used for forming the nanofluids are commonly oxides, metals, carbides, and carbon nanotubes. In the last several years suspensions of nitride nanoparticles in base fluids have been started to be used for research [9][10][11][12][13][31][32][33][34][35]. Promising results have been obtained so far which point out that thermal conductivity enhances with the volume fraction of nanoparticles in suspension.…”

Section: Introductionmentioning

confidence: 99%

“…Promising results have been obtained so far which point out that thermal conductivity enhances with the volume fraction of nanoparticles in suspension. The increase of the thermal conductivity for hexagonal boron nitride nanofluids (average particle size 70 nm) goes up to 26% at volume fractions of 3% for water and up to and 16% for the same volume fraction in EG-based nanofluids [10]. The research of thermophysical properties of EG-based nanofluids with TiN nanoparticles has been conducted for average nanoparticle diameters of 30 nm and 50 nm and nanoparticle volume fraction from 0.0022 to 0.0111.…”

Section: Introductionmentioning

confidence: 99%

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Computational Study of Flow and Heat Transfer Characteristics of EG-Si3N4 Nanofluid in Laminar Flow in a Pipe in Forced Convection Regime

Berberović

Bikić

2019

Energies

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Laminar flow of ethylene glycol-based silicon nitride (EG-Si 3 N 4 ) nanofluid in a smooth horizontal pipe subjected to forced heat convection with constant wall heat flux is computationally modeled and analyzed. Heat transfer is evaluated in terms of Nusselt number (Nu) and heat transfer coefficient for various volume fractions of Si 3 N 4 nanoparticles in the base fluid and different laminar flow rates. The thermophysical properties of the EG-Si 3 N 4 nanofluid are taken from a recently published experimental study. Computational modelling and simulation are performed using open-source software utilizing finite volume numerical methodology. The nanofluid exhibits non-Newtonian rheology and it is modelled as a homogeneous single-phase mixture, the properties of which are determined by the nanoparticle volume fraction. The existing features of the software to simulate single-phase flow are extended by implementing the energy transport coupled to the fluid flow and the interaction of the fluid flow with the surrounding pipe wall via the applied wall heat flux. In addition, the functional dependencies of the thermophysical properties of the nanofluid on the volume fraction of nanoparticles are implemented in the software, while the non-Newtonian rheological behavior of the nanofluid under consideration is also taken into account. The obtained results from the numerical simulations show very good predicting capabilities of the implemented computational model for the laminar flow coupled to the forced convection heat transfer. Moreover, the analysis of the computational results for the nanofluid reflects the increase of heat transfer of the EG-Si 3 N 4 nanofluid in comparison to the EG for all the considered nanoparticle volume fractions and flow rates, indicating promising features of this nanofluid in heat transfer applications.

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“…They reached an improvement of 5.1% and 2.8%, respectively, when using Al 2 O 3 nanofluid. Ilhan et al [22] investigated the preparation, stability and thermophysical properties of hexagonal boron nitride (hBN) containing water, ethylene glycol and ethylene glycol water mixture (by volume 50%) based nanofluids. It is observed that the hBN nanofluids have remarkably higher thermal conductivity values than their corresponding base fluids, depending on the volume concentration of dispersed nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

The heat transfer enhancement of concurrent flow and counter current flow concentric tube heat exchangers by using hexagonal boron nitride/water nanofluid

2019

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Heat exchangers are used in many applications including chemical, oil, and gas power generation, refrigeration, pharmaceuticals, and food processing. Because of their widespread usage, they have various types to serve at different working conditions. Increasing the performance of heat exchangers has become a very interesting field of study since the efficiency of various industrial and domestic systems depend on them. In this study, a coaxial double tube experimental set-up was prepared, and the effect of using nanohexagonal boron nitride nanofluid as hot working fluid on the heat transfer performance increase was investigated. The experiments were carried out in concurrent flow and counter flow conditions for various hot fluid-flow rates to obtain the heat transfer coefficients. Nanohexagonal boron nitride obtained in powder form was used to prepare the nanofluid by a two-step method. The 4 kg nanofluid containing 2% nanohexagonal boron nitride with 0.5% Triton X-100 as a surfactant in terms of mass ratio was prepared for the experiments. Heat transfer experiments were carried out three times by using the prepared nanohexagonal boron nitride/water nanofluid and pure water as hot fluid to reach more precise results. In the result of this study, the total heat transfer coefficient showed an average improvement of 48.78% for the concurrent flow heat exchanger, while an average improvement of 0.36% was observed in the counter flow conditions compared to the base fluid. This study shows the potential of application of nanohexagonal boron nitride/water nanofluid in heat management applications.

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Experimental investigation of heat transfer enhancement and viscosity change of hBN nanofluids

Cited by 65 publications

References 41 publications

Boron nitride (BN) nanofluids as cooling agent in thermal management system (TMS)

Boron nitride (BN) nanofluids as cooling agent in thermal management system (TMS)

Computational Study of Flow and Heat Transfer Characteristics of EG-Si3N4 Nanofluid in Laminar Flow in a Pipe in Forced Convection Regime

The heat transfer enhancement of concurrent flow and counter current flow concentric tube heat exchangers by using hexagonal boron nitride/water nanofluid

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