Heat transfer and flow behaviour of aqueous suspensions of TiO2 nanoparticles (nanofluids) flowing upward through a vertical pipe

He, Yurong; Jin, Y.; Chen, Haisheng; Ding, Yulong; Cang, Daqiang; Huilin, Lu

doi:10.1016/j.ijheatmasstransfer.2006.10.024

Cited by 834 publications

(359 citation statements)

References 35 publications

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“…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. presents the increase in viscosity with the increase in particle size.…”

Section: Effect Of Particle Size and Shapesupporting

confidence: 69%

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: 69%

A brief review on viscosity of nanofluids

et al. 2014

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“…Moreover, an enhancement of 68.6% was recorded at a flow rate of 30 g/s. Similar enhancement in heat transfer coefficients were observed at 0.1 wt% CNTs in a laminar flow regime by Ding et al [12] Furthermore, it is known that for high aspect ratio nanoparticles the heat transfer enhancement is also higher as observed by He et al [21] for aqueous based titania nanofluids. For high aspect ratio nanoparticles, there seems to be a relationship between rheological behaviours.…”

Section: Rheologysupporting

confidence: 81%

“…There are some reports on enhancement in convective heat transfer by nanofluids. [7,[17][18][19][20][21][22][23][24][25][26][27][28][29] However, there are few studies showing inconsistent results as reported by Pak and Cho, [25] Chein and Chuang, [26] Ding et al, [27] Lee and Mudawar [28] and Nelson et al, [29] and also studies showing a decrease in heat transfer coefficient by the addition of nanoparticles to the base fluids. [27,30] The experiments were usually carried out in a pipe or channel flows with constant heat flux.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of heat transfer in CNT nanofluids

Rashmi

Khalid

Ismail

et al. 2013

Journal of Experimental Nanoscience

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Nanofluids with their enhanced thermal conductivity are believed to be a promising coolant in heat transfer applications. In this study, carbon nanotube (CNT) nanofluids of 0.01 wt%, stabilised by 1.0 wt% gum arabic were used as a cooling liquid in a concentric tube laminar flow heat exchanger. The flow rate of cold fluid varied from 10 to 50 g/s. Both experimental and numerical simulations were carried out to determine the heat transfer enhancement using CNT nanofluids. Computational fluid dynamics (CFD) simulations were carried out using Fluent v 6.3 by assuming single-phase approximation. Thermal conductivity, density and rheology of the nanofluid were also measured as a function of temperature. The results showed thermal conductivity enhancement from 4% to 125% and nearly 70% enhancement in heat transfer with increase in flow rate. Numerical results exhibited good agreement with the experimental results with a deviation of AE3:0%. CNT nanofluids at 0.01 wt% CNTs showed Newtonian behaviour with no significant increase in the density.

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“…Experiments on laminar and turbulent forced convection of water-based nanofluids have shown that nanofluids can improve the heat transfer coefficient within the range from a few percent up to 350% for carbon nanotubes [14][15][16][17][18][19][20][21][22][23][24][25]. A huge number of works appeared in this area over the last two decades.…”

Section: Introductionmentioning

confidence: 99%

“…In [23] it was found that the heat transfer coefficient definitely increases with increase in the concentration of nanoparticles in laminar and turbulent regimes at fixed Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of turbulent forced convection of nanofluid in channels with cylindrical and spherical hollows

Минаков

Guzei

Meshkov

et al. 2017

International Journal of Heat and Mass Transfer

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Experimental study of forced turbulent convection of water-based nanofluids with nanoparticles of zirconium oxide (ZrO2) was carried out in smooth tubes and channels with wall heat transfer enhancers. Nanopowders with average particle size of 44 and 105 nm were used in the experiments. The Reynolds number ranged from 3000 to 8000. It is revealed that the increments in the heat transfer coefficient and the pressure drop when using nanofluids depend on the surface shape of the channel. It is shown that nanofluids allow reaching thermal-hydraulic efficiency comparable to that of the channels with artificial heat transfer enhancers.

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Heat transfer and flow behaviour of aqueous suspensions of TiO2 nanoparticles (nanofluids) flowing upward through a vertical pipe

Cited by 834 publications

References 35 publications

A brief review on viscosity of nanofluids

A brief review on viscosity of nanofluids

Experimental and numerical investigation of heat transfer in CNT nanofluids

Experimental study of turbulent forced convection of nanofluid in channels with cylindrical and spherical hollows

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