Experimental investigations of the viscosity of nanofluids at low temperatures

Aladag, Bahadir; Halelfadl, Salma; Döner, Nimeti; Maré, Thierry; Duret, Steven; Estellé, Patrice

doi:10.1016/j.apenergy.2011.12.101

Cited by 187 publications

(64 citation statements)

References 28 publications

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“…As can be seen from Figures 5a and 5b, the nanofluid with a 0.5% weight fraction has the highest pressure drop values compared to the base fluid and the nanofluid with a 0.05% weight fraction for both types of glass. Also, the pressure drop of the nanofluids increases when the Reynolds number increases, as reported by Aladag et al (2012) and Halelfadl et al (2015). With regard to the pressure drop, almost identical results were obtained for the nanofluid at a 0.05% weight fraction and the base fluid, with similar pumping power and heat transfer.…”

Section: Resultssupporting

confidence: 64%

“…Phuoc et al (2011) show experimentally that the dynamic viscosity of CNT nanofluids increases with the volume concentration. 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.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultssupporting

confidence: 64%

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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show abstract

“…This result was supported by previous researches in which temperature played an important role in affecting viscosity of nanofluids, where viscosity decreased at a higher temperature [39,40]. At higher temperatures, the particles in nanofluids become active and can cause van der Waals forces and hydrogen bonds to break, thereby decreasing viscosity.…”

Section: Viscositysupporting

confidence: 78%

Thermal conductivity and viscosity of deionised water and ethylene glycol-based nanofluids

Abdullah¹,

Mohamad²,

Hashim³

et al. 2016

J. MECH. ENG. SCI.

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This paper focused on thermal conductivity and viscosity of deionised water and ethylene glycol-based nanofluids at three different temperatures (6C, 25C and 40C). For the preparation of nanofluids, a two-step method, comprised of homogenisation and sonication, was used on a mixture of MWCNT-OH, PVP and the base fluid. The results revealed that thermal conductivity was enhanced by about 8.86% for 0.8 wt% deionised water-based MWCNT-OH nanofluid, and by 5.37% for 0.2 wt% ethylene glycol-based MWCNT-OH nanofluid. Meanwhile, in viscosity test, the highest temperature of 40C exhibited lowest viscosity. This phenomenon happened only with ethylene glycol-based nanofluid, whilst the data on the viscosity of deionised water-based nanofluid was inconsistent at certain nanofluid concentrations . In conclusion, addition of MWCNT-OH into base fluid enhanced base fluid performance , giving it the potential to be used in cooling system applications.

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“…nano-particles, CNT) in a base fluid (nanofluid) has evolved over the past decade. The experiments have unveiled improvements in the rheological (Aladag et al 2012;Chen et al 2011;Jyothirmayee Aravind et al 2011;Lei et al 2008;Murshed et al 2008;Hobbie and Fry 2007;Vakili-nezhaad and Dorany 2009;Phuoc et al 2011;Liu et al 2005) as well as in the thermal (Ding et al 2006;Hwang et al 2006;Kalinina et al 2011;Ö zerinç et al 2010;Venkata Sastry et al 2008;Xie and Chen 2009;Kleinstreuer and Feng 2011;Choi et al 2001;Karthikeyan et al 2008;Xie et al 2002) properties of the nanofluid system, compared to its base fluid.…”

Section: Introductionmentioning

confidence: 99%

Thermal and rheological properties improvement of drilling fluids using functionalized carbon nanotubes

Fazelabdolabadi¹,

Khodadadi

Sedaghatzadeh

2014

Appl Nanosci

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The application of functionalized/unfunctionalized (multi-walled) carbon nanotubes (CNT) was investigated in the context of formulating nano-based drilling fluids from water/oil-based fluid templates. CNT functionalization was attempted by applying hydrophilic functional groups onto the surface of the nanotubes via acid treatment. Experimental data were collected for thermal conductivity, viscosity/yield point, and filtrate amount in all samples. The time evolution of thermal conductivity was studied, as well as the effects of temperature and CNTs volume fraction on the parameter. Scanning electron microscopy (SEM) was used to monitor CNTs dispersion quality. The thermal conductivity results unveil considerable enhancements, by as much as 23.2 % (1 % vol. functionalized CNT) in CNT-water-based case at ambient temperature, with extended improvement of 31.8 % at an elevated temperature of 50°C. Corresponding results for the CNT-oil-based case exhibit an improvement in thermal conductivity by 40.3 % (unfunctionalized) and 43.1 % (functionalized) and 1 % volume fraction of CNT. The rheological results follow an analogous improvement trend. For the CNT-oil-based case, the filtration tests conducted at 138°C and 500 (psi) show a 16.67 % reduction in filtrate amount (1 % vol. CNT). The time evolution of thermal conductivity was found to nearly equalize (at an amount of 9.7 %) after 100 h of sample preparation in both functionalized and unfunctionalized CNT-oil-based cases.

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Experimental investigations of the viscosity of nanofluids at low temperatures

Cited by 187 publications

References 28 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

Thermal conductivity and viscosity of deionised water and ethylene glycol-based nanofluids

Thermal and rheological properties improvement of drilling fluids using functionalized carbon nanotubes

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