Assessment of TiO2 water-based nanofluids with two distinct morphologies in a U type evacuated tube solar collector

Hosseini, Seyed Mohammad Sadegh; Dehaj, Mohammad Shafiey

doi:10.1016/j.applthermaleng.2020.116086

Cited by 65 publications

(10 citation statements)

References 39 publications

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“…where v 1 , v 2 , and v 3 are velocity components along x, y and z axes, respectively. υ stands for the kinematic viscosity coefficient, μ is the coefficient of dynamic viscosity, C p stands for the specific heat at a constant pressure, ρ is the density, T is the fluid temperature, σ is the electrical conductivity of the fluid, T ∞ is the ambient fluid temperature, T s is the surface temperature, K stands for the thermal conductivity of the fluid, q r = −(4σ * /3k * )∂T 4 / ∂z is Rosseland's radiative heat flux, where k * is the mean absorption coefficient value and σ * is the Stefan Boltzman constant. 35 The thermophysical parameters of the hybrid nanofluid are presented as in Hosseinzadeh et al 36 The dynamic viscosity of hybrid nanofluid μ hnf is expressed as follows:…”

Section: Physical Modelmentioning

confidence: 99%

“…2 ZnO ethylene glycol/water nanofluid's heat transfer and flow behavior inside mini channels of two multiports were presented by Wen et al 3 The thermophysical properties were studied by adding TiO 2 species with the spherical and wire-like arrangements in water-based nanofluid was experimented by Hosseini and Dehaj. 4 Ramzan et al 5 investigated the effect of activation energy with partially ionized nanofluid flow under the impact of magnetohydrodynamics (MHD). Convective boundary and zero mass flux conditions for the flow of nanofluid over a rotating stretching disk were elaborated by Abbasi et al 6 Alikhan and Maghrebi 7 investigated the heat transfer rate improvement by the addition of nanofluids and also by varying flow methods.…”

Section: Introductionmentioning

confidence: 99%

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Computational analysis of rotating flow of hybrid nanofluid over a stretching surface

Lei

Siddique

Ashraf

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Rotating flow for hybrid nanofluid over a stretching surface in the presence of magnetic effect is examined numerically. Hybrid nanofluid consists of graphene oxide and molybdenum disulfide in water base fluid. The inclusion of more than one nanoparticle is carried out due to some outstanding features such as astonishing thermal conduction, which are substantial in heat exchangers, nanotechnology, electronics, and material sciences. In order to attain numerical resolution, the partial differential formulation has been transformed into the corresponding ordinary differential equations. By implementation of apposite similarity variables, the classical Runge–Kutta method and shooting argument have been held to yield finding for the dependent quantities. Thermal transportation enhancement is the need of the day, so this study is made to meet the necessity of industries. A velocity component shows an upsurge with raise in the magnetic field parameter. The magnitude of the velocity component for hybrid nanofluid has a lower boundary as compared to single nanofluid. The temperature profile expressed that hybrid nanofluid is more effective than single nanofluid. These investigations are applicable to the field of the biomedical, automotive industry, nuclear cooling systems, and heat exchangers.

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Section: Physical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational analysis of rotating flow of hybrid nanofluid over a stretching surface

Lei

Siddique

Ashraf

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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show abstract

“…However, an increment in the pressure drop was observed for both hybrid nanofluids. Thus, a comprehensive evaluation factor, namely, the PI, is introduced to evaluate the thermohydraulic performance of the nanofluids and hybrid nanofluids in the MCHS 4,36,66,67 . The nanofluid is said to be advantageous over the base fluid when PI is higher than one.…”

Section: Combined Thermohydraulic Characteristicsmentioning

confidence: 99%

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Souby

Bargal

Wang

2021

Energy Science & Engineering

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Recently, the combination of hybrid nanofluids with microchannel heat sinks (MCHSs) has led to superior heat removal from high heat flux electronics chips.The present work aimed to evaluate numerically the first and second law performances of MCHSs using the new cost-effective binary/ternary hybrid nanofluids. Water-based binary and ternary hybrid nanofluids include the MgO/ TiO 2 nanocomposite and the CuO/MgO/TiO 2 nanocomposite, respectively. The effects of the hybrid nanofluid volume concentration (vol.%) and Reynolds number (Re) on the heat transfer, pressure drop, combined thermohydraulic characteristics, and entropy generation characteristics of the MCHSs are discussed.The results show that higher values of the convective heat transfer coefficient, pressure drop, and frictional entropy generation rate are obtained when using hybrid nanofluids with high Re and vol.% values. Furthermore, by increasing the Re and vol.% values of the hybrid nanofluids, the bottom wall temperature, total thermal resistance, and thermal entropy generation rate decreased, and an increased temperature uniformity was obtained on the bottom surface of the MCHSs. In conclusion, the applied hybrid nanofluids are considered to be more promising heat transfer fluids when compared with conventional fluids such as water. Particularly, the CuO/MgO/TiO 2 -water ternary hybrid nanofluid exhibited a better heat transfer efficiency than did the MgO/TiO 2 -water binary hybrid nanofluid.

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“…The thermal efficiency of a solar collector was improved up to 88 % using a carbon nanofluid at 313 K 41. Hosseini and Dehaj 42 studied two samples of water‐based TiO 2 nanofluids. The spherical and wire‐like geometry (TiO 2 NPs‐nanofluid, TiO 2 NWs‐nanofluid) were experimentally investigated.…”

Section: Introductionmentioning

confidence: 99%

Water Desalination Using Solar Thermal Collectors Enhanced by Nanofluids

et al. 2021

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The absorption efficiency of a solar collector using different types of nanofluids was improved. Experimental work was carried out to investigate the flat‐plate and evacuated‐tube collectors under outdoor conditions to produce distilled water. A pilot plant was designed and installed. The yield of distilled water at different seawater flow rates and the physical properties of nanofluids were determined. Solar intensity, water mass flow rate, and temperature were measured. The performance of the desalination unit was evaluated in the presence of carbon nanotubes in paraffin wax and ethylene glycol nanofluids. The evaporation efficiency of the flat‐plate collector was improved up to 36 % in the presence of ethylene glycol nanofluid at 80–100 °C.

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Assessment of TiO2 water-based nanofluids with two distinct morphologies in a U type evacuated tube solar collector

Cited by 65 publications

References 39 publications

Computational analysis of rotating flow of hybrid nanofluid over a stretching surface

Computational analysis of rotating flow of hybrid nanofluid over a stretching surface

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Water Desalination Using Solar Thermal Collectors Enhanced by Nanofluids

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