Viscosity data for Al2O3–water nanofluid—hysteresis: is heat transfer enhancement using nanofluids reliable?

Nguyen, Cong Tam; Desgranges, F.; Galanis, Nicolas; Roy, G.; Maré, Thierry; Boucher, S.G.; Mintsa, Honorine Angue

doi:10.1016/j.ijthermalsci.2007.01.033

Cited by 528 publications

(226 citation statements)

References 32 publications

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“…According to their observation, at 4 % particle volume concentration, 36 and 47 nm alumina/water nanofluids show almost the same viscosity and if the volume concentration is increased then fluids with bigger size nanoparticles shows higher viscosity than the smaller ones. In another literature, the same authors supported their previous experiment for higher particle fraction of 7 and 9 % [29]. According to He et al [30], the viscosity of TiO 2 -distilled water nanofluids at different particle sizes (95 nm, 145 nm) increases with the increase in particle size.…”

Section: Effect Of Particle Size and Shapesupporting

confidence: 67%

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A brief review on viscosity of nanofluids

et al. 2014

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Since the past decade, rapid development in nanotechnology has produced several aspects for the scientists and technologists to look into. Nanofluid is one of the incredible outcomes of such advancement. Nanofluids (colloidal suspensions of metallic and nonmetallic nanoparticles in conventional base fluids) are best known for their remarkable change to enhanced heat transfer abilities. Earlier research work has already acutely focused on thermal conductivity of nanofluids. However, viscosity is another important property that needs the same attention due to its very crucial impact on heat transfer. Therefore, viscosity of nanofluids should be thoroughly investigated before use for practical heat transfer applications. In this contribution, a brief review on theoretical models is presented precisely. Furthermore, the effects of nanoparticles' shape and size, temperature, volume concentration, pH, etc. are organized together and reviewed.

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Section: Effect Of Particle Size and Shapesupporting

confidence: 67%

“…Some researchers declared exceptional rise in viscosity with a rise in volume concentration. A detailed study can be found in references [29,47,48].…”

Section: Effect Of Volume Concentrationmentioning

confidence: 99%

A brief review on viscosity of nanofluids

et al. 2014

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“…Fig. 9 Comparison with previously reported work and our proposed work on temperature-dependent nanofluid thermal conductivity ratio for alumina nanofluid (Maxwell 1954;Hamilton and Crosser 1962;Wang et al 2008;Beck et al 2009;Moghadassi et al 2010;Kleinstreuer and Feng 2011;Chon et al 2005;Li and Peterson 2006) Due to the particle volume concentration the dynamic viscosity of nanofluid has been increased and as temperature increases viscosity decreases, which is concluded by Nguyen et al (Nguyen et al 2008;Chandrasekar et al 2010). This process is the witness for the particle suspension beyond the critical temperature, which caused by the hysteresis phenomenon.…”

Section: Effective Viscosity Of Nanofluidsupporting

confidence: 65%

Temperature-dependent thermal conductivity and viscosity of synthesized α-alumina nanofluids

Shah

Ranjan

Davariya³

et al. 2017

Appl Nanosci

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In the present work, we focused on the thermal conductivity and viscosity of the synthesis as well as characterize metal oxide a-Al 2 O 3 nanoparticles suspended in distilled water:ethylene glycol (60:40) ratio based stable colloidal nanofluid. The band gap of the a-Al 2 O 3 with and without surfactant is 4.42 and 4.59 eV, respectively. The results show that nanoparticle with polyvinyl alcohol surfactant has smaller crystalline size (*23 nm) than without surfactant (*36 nm). The synthesized nanofluids have good stability after 15 days of synthesis which is characterized by zeta potential analyzer. Thermal conductivity and viscosity are measured for 0.1 and 0.5 wt% concentration of alumina for with and without surfactant. The concentration of particles and added surfactant are responsible for stable fluid, thermal conductivity enhancement, and viscosity of nanofluid with respect to temperature. Therefore, the novel combinations of characterized properties of a-Al 2 O 3 nanofluid has proved to be the best thermally stable heat transfer fluid compared to conventional cooling fluids.

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“…They showed that CNT exhibit a shear thinning behaviour and that the Non-Newtonian character may not be solely attributed to the presence of the surfactant (Gum Arabic). Nguyen et al [20] have investigated experimentally the effect of the temperature and the particles concentration on viscosity for Al 2 O 3 aqueous based nanofluids. They showed a hysteresis behavior of dynamic viscosity due to temperature effect, which is more pronounced for high particles concentration.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of the viscosity of nanofluids at low temperatures

et al. 2012

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The effects due to temperature and shearing time on viscosity for Al 2 O 3 /water and CNT/water based nanofluids at low concentration and low temperatures are experimentally investigated. The viscosity data were collected using a stress-controlled rheometer equipped with parallel plate geometry under up and down shear stress ramp. CNT and Al2O3 water based nanofluids exhibited hysteresis behaviour when the stress is gradually loaded and unloaded, depending also on shearing time. Experiments also showed that the nanofluid suspensions indicated either Newtonian or nonNewtonian behaviour, depending on shear rate. CNT water based nanofluid behaves as Newtonian fluid at high shear rate whereas Al 2 O 3 water based nanofluid is non-Newtonian within the range of low temperatures investigated.

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Viscosity data for Al2O3–water nanofluid—hysteresis: is heat transfer enhancement using nanofluids reliable?

Cited by 528 publications

References 32 publications

A brief review on viscosity of nanofluids

A brief review on viscosity of nanofluids

Temperature-dependent thermal conductivity and viscosity of synthesized α-alumina nanofluids

Experimental investigations of the viscosity of nanofluids at low temperatures

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