Hydraulic and heat transfer study of SiO2/water nanofluids in horizontal tubes with imposed wall temperature boundary conditions

Ferrouillat, Sébastien; Bontemps, André; Ribeiro, João-Paulo; Gruss, Jean-Antoine; Soriano, Olivier

doi:10.1016/j.ijheatfluidflow.2011.01.003

Cited by 162 publications

(57 citation statements)

References 37 publications

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“…Equation 2 ellipsoidal particles [18,28]: ( 3 ) where C µ depends on the ratio of the revolution ellipsoid axes and is equal to 2.5 for spherical particles and not tubes with an aspect ratio of 1 333. In this case, C µ equal to 60 correlates the volume concentrations of 0.33% and 0.75% well.…”

Section: Effective Viscosity Of the Mwcnt-water Nanofluidmentioning

confidence: 99%

“…Ferrouillat et al [18] tested SiO 2 -water nanofluids for the entire flow range but only considered results for the turbulent flow range. At a volume concentration of 18.9%, the heat transfer enhancement was approximately 50% for a Reynolds number greater than 1 000.…”

Section: Introductionmentioning

confidence: 99%

“…At a volume concentration of 18.9%, the heat transfer enhancement was approximately 50% for a Reynolds number greater than 1 000. Evaluating the literature shows that there are few works [6,7,8,9,10,11,13,14,17,18] that have reported on convective heat transfer characteristics of nanofluids, especially CNT nanofluids [3,12,15,16]. All of the studies considered in literature either test in the laminar [3,7,8,9,10,11,12,13,14,15] or high turbulent flow range [6,7,13,15,16,17] and very few tested in the transitional flow range [19].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The influence of multi-walled carbon nanotubes on single-phase heat transfer and pressure drop characteristics in the transitional flow regime of smooth tubes

Meyer

McKrell

Grote

2013

International Journal of Heat and Mass Transfer

115

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In this paper, the convective heat transfer enhancement of aqueous suspensions of multiwalled carbon nanotubes flowing through a straight horizontal tube was investigated experimentally for a Reynolds number range of 1 000 -8 000, which included the transitional flow regime. The tube was made out of copper with an internal diameter of 5.16 mm.Experiments were conducted at a constant heat flux of 13 kW/m 2 with 0.33%, 0.75% and 1.0% volume concentrations of multi-walled carbon nanotubes. The nanotubes had an outside diameter of 10 -20 nm, an inside diameter of 3 -5 nm and a length of 10 -30 µm.Temperature and pressure drop measurements were taken, from which the heat transfer coefficients and friction factors were determined as a function of Reynolds number. It was found that heat transfer was enhanced when comparing the data on a Reynolds-Nusselt graph but when comparing the data at the same velocity, it was shown that heat transfer was not enhanced. Performance evaluation of the nanofluids showed that the increase in viscosity was four times the increase in the thermal conductivity, which resulted in an inefficient nanofluid.

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Section: Effective Viscosity Of the Mwcnt-water Nanofluidmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of multi-walled carbon nanotubes on single-phase heat transfer and pressure drop characteristics in the transitional flow regime of smooth tubes

Meyer

McKrell

Grote

2013

International Journal of Heat and Mass Transfer

115

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“…Their results show that the impact of viscosity and pressure drop is important and has to be taking into account before to use nanofluids. Due to high viscosity of SiO 2 /water based nanofluids at high particles concentration, Ferrouillat et al [11] reported that the pumping power is very high and that the practical benefits of using nanofluids is not significant compared to base fluid.…”

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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“…This shows that these properties are closely correlated. In fact, a significant increase in viscosity can lead to a significant pressure drop which can reduce the practical benefits of nanofluids in some industrial applications [7,8]. Ding et al [9] found that thermal conductivity of CNT based nanofluid increases significantly with the temperature by 15% at 20 o C, 30% at 25 o C and by 79% at 40 o C at the same volume fraction.…”

Section: Introductionmentioning

confidence: 99%

A Review of Heat Transfer Enhancement Using Nano Fluids With Different Base Fluids

2016

IJAERD

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Hydraulic and heat transfer study of SiO2/water nanofluids in horizontal tubes with imposed wall temperature boundary conditions

Cited by 162 publications

References 37 publications

The influence of multi-walled carbon nanotubes on single-phase heat transfer and pressure drop characteristics in the transitional flow regime of smooth tubes

The influence of multi-walled carbon nanotubes on single-phase heat transfer and pressure drop characteristics in the transitional flow regime of smooth tubes

Experimental investigations of the viscosity of nanofluids at low temperatures

A Review of Heat Transfer Enhancement Using Nano Fluids With Different Base Fluids

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