A comprehensive review of thermo-physical properties and convective heat transfer to nanofluids

Solangi, K.H.; Kazi, S.N.; Luhur, Muhammad Ramzan; Badarudin, A.; Amiri, Ahmad; Sadri, Rad; Zubir, Mohd Nashrul Mohd; Gharehkhani, Samira; Teng, Kah Hou

doi:10.1016/j.energy.2015.06.105

Cited by 256 publications

(83 citation statements)

References 242 publications

(255 reference statements)

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“…A number of experimental measurements and numerical simulations have been reported on the heat conduction enhancements of these nano-suspensions containing small volume fraction of nanoparticles (NP) (Particle loading <0.1) relative to the base fluid34.…”

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confidence: 99%

Fractal aggregation kinetics contributions to thermal conductivity of nano-suspensions in unsteady thermal convection

Sui

Zhao

Bin‐Mohsin

et al. 2016

Sci Rep

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Nano-suspensions (NS) exhibit unusual thermophysical behaviors once interparticle aggregations and the shear flows are imposed, which occur ubiquitously in applications but remain poorly understood, because existing theories have not paid these attentions but focused mainly on stationary NS. Here we report the critical role of time-dependent fractal aggregation in the unsteady thermal convection of NS systematically. Interestingly, a time ratio λ = tp/tm (tp is the aggregate characteristic time, tm the mean convection time) is introduced to characterize the slow and fast aggregations, which affect distinctly the thermal convection process over time. The increase of fractal dimension reduces both momentum and thermal boundary layers, meanwhile extends the time duration for the full development of thermal convection. We find a nonlinear growth relation of the momentum layer, but a linear one of the thermal layer, with the increase of primary volume fraction of nanoparticles for different fractal dimensions. We present two global fractal scaling formulas to describe these two distinct relations properly, respectively. Our theories and methods in this study provide new evidence for understanding shear-flow and anomalous heat transfer of NS associated non-equilibrium aggregation processes by fractal laws, moreover, applications in modern micro-flow technology in nanodevices.

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mentioning

confidence: 99%

Fractal aggregation kinetics contributions to thermal conductivity of nano-suspensions in unsteady thermal convection

Sui

Zhao

Bin‐Mohsin

et al. 2016

Sci Rep

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“…The main objective of the application of nanofluids is to achieve the highest thermal conductivity at the lowest possible concentration of nanoparticles. Due to the molecular chain behavior of nanofluids, the suitable dispersed nanoparticles in the base liquid have the advantages of high thermal conductivity, microchannel cooling, no blockage, reducing erosion probability, and increasing pump power (Solangi et al, 2015). Due to the effect of their small size, the coefficient of resistance is not increased significantly as the coefficient of fluid heat transfer increases.…”

Section: Introductionmentioning

confidence: 92%

Numerical Simulation of Flow and Heat Transfer Characteristics of CuO-Water Nanofluids in a Flat Tube

She

Fan

2018

Front. Energy Res.

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In this paper, water and CuO-water nanofluids are selected as working fluids. The characteristics of fluid flow and heat transfer in a heat transfer tube are analyzed by means of numerical simulation. The effect of nanofluid concentration on the flow and heat transfer characteristics of the flat tube under the condition with a Reynolds number of 6,000∼10,000 is analyzed and compared with that of the circular tube. The results show that the addition of nanoparticles in the nanofluid has little effect on the velocity and temperature distribution in the flow channel. With the increase of nanofluid concentration, the heat transfer coefficient and flow resistance of the fluid increased. And the comprehensive evaluation factor was 2.51∼3.29, which had the effect of enhancing heat exchange. There is a similar trend in the same concentration with different Reynolds numbers. Compared with the circular tube, the nanofluid has a better ability to enhance heat transfer when it flows in the flat tube. Under conditions with the same fluid concentration, the effect of the application of the nanofluids on the flat tube is better.

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“…In other words, they have presented that an updated review of properties of nanofluids, such as physical (thermal conductivity) and rheological properties, with emphasis on their heat transfer enhancement characteristics in this study [24]. Haddad et al have observed the nanofluid preparation methods reported by different investigators in an attempt to find a suitable method for preparing stable nanofluids.…”

Section: Introductionmentioning

confidence: 99%

“…The idea of putting high conductivity nano-sized solid particles into fluid for improving the thermal conductivity is one of the subjects studied for many years [1]. Thermal conductivity very good and the most widely used metallic solids particles; copper, aluminum, silver, gold and iron, nonmetallic solids solids particles; aluminum oxide (Al 2 O 3 ), cupric oxide (CuO) Titanium dioxide (TiO 2 ), Zinc oxide (ZnO), Silicon dioxide (SiO 2 ) have been defined [2]. Thermal conductivity enhancement of nanofluids depends on adding nanoparticles and the nanoparticle aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermo‐physical Properties of Diatomite/Water Nanofluid

Öztaş¹,

Karakaya²,

İskender³

2016

GMBD

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In this study, the thermo physical properties of the nanofluid obtained with prepared solution by adding as basic fluid 1.3% the diatomite nanoparticles into water were determined. Many researchers are working to improve the performance of heat transfer fluids. One of the methods used, if we want to increase the overall thermal conductivity of the fluid, the high thermal conductive materials such as metal oxides, metals and carbon should be added to heat transfer fluids as nano-sized particles. In this study, specific heat capacity, thermal conductivity and viscosity of nanofluid obtained with diatomite nanoparticles in order to increase the fluid's thermal performance and not found in the literature were investigated experimentally.

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A comprehensive review of thermo-physical properties and convective heat transfer to nanofluids

Cited by 256 publications

References 242 publications

Fractal aggregation kinetics contributions to thermal conductivity of nano-suspensions in unsteady thermal convection

Fractal aggregation kinetics contributions to thermal conductivity of nano-suspensions in unsteady thermal convection

Numerical Simulation of Flow and Heat Transfer Characteristics of CuO-Water Nanofluids in a Flat Tube

Investigation of Thermo‐physical Properties of Diatomite/Water Nanofluid

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