Shear History Effect on the Viscosity of Carbon Nanotubes Water-based Nanofluid

Estellé, Patrice; Halelfadl, Salma; Döner, Nimeti; Maré, Thierry

doi:10.2174/1573413711309020010

Cited by 43 publications

(18 citation statements)

References 40 publications

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“…Many studies have shown that the dynamic viscosity of nanofluids decreases as the temperature increases (Aladag et al, 2012). Other effects may also influence the dynamic viscosity and rheological behavior of CNT-based nanofluids, such as the presence of agglomerates (Chen et al, 2013), thixotropic behavior (Estellé et al, 2013), and the synthesis methods of the CNT. Most recently, nanofluids with carbon-nanoparticles have also been suggested as working fluid because of their unique thermal and optical properties (Sabourin et al, 2009;Gan & Li, 2012).…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of Carbon Nanotube Nanofluids in Solar Microchannel Collectors: an Experimental Study

Ahlatli¹,

Maré²,

Estellé³

et al. 2016

IJTech

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Many studies show that nanofluids, especially with carbon nanotubes, improve heat transfer. Other studies show that a nanofluid is a good candidate for solar systems because of its good absorptivity. We are facing an increasing number of miniaturized and more powerful systems. Especially in microelectronics, small heat sinks with high heat transfer are being developed, called micro-channel heat sinks (MCHS). In this paper, the heat transfer behavior of carbon nanotube-water nanofluid in a microchannel solar collector is studied experimentally. The exchanger is composed of 16 micro-channel hydraulic diameters of 1 mm and a glass or quartz cover with a surface area of 25 cm 2 . Solar radiation is simulated by a halogen lamp. The experimental set-up includes a solar meter, pressure, and temperature sensors, and it is allowed to control the flow. The nanofluid is a solution of water containing a 0.01%, 0.05%, 0.1%, and 0.5% weight fraction, respectively, of the carbon nanotubes, which are 9.2 nm in diameter and 1.5 µm in length. Viscosity and density are measured experimentally. The evolution of efficiency and the pressure drop are presented according to the Reynolds number and are compared with the results obtained with distilled water.

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Section: Introductionmentioning

confidence: 99%

Thermal Performance of Carbon Nanotube Nanofluids in Solar Microchannel Collectors: an Experimental Study

Ahlatli¹,

Maré²,

Estellé³

et al. 2016

IJTech

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“…Using high shear mixing and ultrasonication methods, they observed that the non-Newtonian character of nanofluids influences the overall thermal enhancement. Estellé et al (2013) performed experiments on the steady-state rheological behaviour of carbon nanotube (CNT) water-based nanofluid and considered the influence of a controlled pre-shear history on the viscosity. They examined both the effect of the influence of stress rate during pre-shear and the effect of resting time before viscosity measurement, and demonstrated that CNT water-based nanofluid behaves as a viscoelastic media at low shear rate and as a shear-thinning fluid at higher shear rates, with the observed behaviour being a function of shear history due to the breakdown in the structural network of nanofluid agglomerates.…”

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confidence: 99%

Group analysis and numerical computation of magneto-convective non-Newtonian nanofluid slip flow from a permeable stretching sheet

Uddin

Ferdows

Bég³

2013

Appl Nanosci

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Two-dimensional magnetohydrodynamic boundary layer flow of non-Newtonian power-law nanofluids past a linearly stretching sheet with a linear hydrodynamic slip boundary condition is investigated numerically. The non-Newtonian nanofluid model incorporates the effects of Brownian motion and thermophoresis. Similarity transformations and corresponding similarity equations of the transport equations are derived via a linear group of transformations. The transformed equations are solved numerically using Runge-Kutta-Fehlberg fourth-fifth order numerical method available in the Maple 14 software for the influence of power-law (rheological) index, Lewis number, Prandtl number, thermophoresis parameter, Brownian motion parameter, magnetic field parameter and linear momentum slip parameter. Validation is achieved with an optimized Nakamura implicit finite difference algorithm (NANO-NAK). Representative results for the dimensionless axial velocity, temperature and concentration profiles have been presented graphically. The present results of skin friction factor and reduced heat transfer rate are also compared with the published results for several special cases of the model and found to be in close agreement. The study has applications in electromagnetic nanomaterials processing.

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“…Thus, the morphology and the dispersion state of the nanofluids was determined by scanning electron microscopy (SEM-JEOL-JSM-6301 F) performed on dried nanofluid, using an accelerating voltage ranging from 7 to 10 kV and a working distance of 8 mm. It is worth noting that SEM characterization of the starting suspension with a volume fraction of 0.5% was previously performed, showing that at this concentration, the nanotubes are mainly entangled and can form aggregates [29]. This can explain, at least partially, the substantial thermal conductivity enhancement at this particle loading.…”

Section: Resultsmentioning

confidence: 82%

Unexpected sharp peak in thermal conductivity of carbon nanotubes water-based nanofluids

Maré

Halelfadl

Vaerenbergh

et al. 2015

International Communications in Heat and Mass Transfer

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We report here the thermal conductivity measurement of carbon nanotubes water-based nanofluids stabilized by sodium dodecylbenzene sulfonate as a function of volume fraction and temperature. For the first time, we further show the existence of a sharp peak in thermal conductivity at very small volume fraction below theoretical percolation threshold which is temperature independent. This preliminary study evidences the potential of promising and useful nanofluid for practical applications in cooling and energy systems and heat exchangers, as viscosity penalty is obviously vanished at this concentration.

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Shear History Effect on the Viscosity of Carbon Nanotubes Water-based Nanofluid

Cited by 43 publications

References 40 publications

Thermal Performance of Carbon Nanotube Nanofluids in Solar Microchannel Collectors: an Experimental Study

Thermal Performance of Carbon Nanotube Nanofluids in Solar Microchannel Collectors: an Experimental Study

Group analysis and numerical computation of magneto-convective non-Newtonian nanofluid slip flow from a permeable stretching sheet

Unexpected sharp peak in thermal conductivity of carbon nanotubes water-based nanofluids

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