Statistical investigation for developing a new model for rheological behavior of ZnO–Ag (50%–50%)/Water hybrid Newtonian nanofluid using experimental data

Ruhani, Behrooz; Toghraie, Davood; Hekmatifar, Maboud; Hadian, Mahdieh

doi:10.1016/j.physa.2019.03.118

Cited by 153 publications

(19 citation statements)

References 74 publications

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“…The rheological investigation of water-based nanofluids has been carried out by various researchers [12][13][14]. However, less researches have been dedicated to the rheological study of nanofluids of mineral oils [15][16][17][18] and synthetic oils and even lesser investigations have been carried on vegetable oils mixed with nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on rheological properties of vegetable oils mixed with titanium dioxide nanoparticles

Shafi

Charoo

2019

J Braz. Soc. Mech. Sci. Eng.

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The paper focuses on studying the rheological properties of different vegetable oils mixed with TiO 2 nanoparticles. The rheological tests of vegetable oils are conducted on cone and plate geometry of Anton Paars rheometer (MCR-102). TiO 2 nanoparticles are added in 0.5 wt%, 1 wt% and 1.5 wt% concentration. The density of nanofluids is measured from 20-80 °C, and the viscosity of nanofluids is measured at temperatures of 40 °C, 70 °C and 100 °C. All the nanofluids depict Newtonian behaviour at different temperatures and are quantified by power law. The introduction of nanoparticles in the oils leads to the increase in viscosity with 1.5 wt% TiO 2 concentration displaying maximum increase in viscosity in all the bio-oils. The variation of viscosity with temperature, shear rate and particle volume fraction is observed, and the measured values of viscosity are correlated with the existing theoretical viscosity models. Keywords Sustainable lubrication • Vegetable oils • Titanium dioxide • Nanoparticles List of symbols U Experimental viscosity (mm 2 /s) at 40 °C Y Experimental viscosity (mm 2 /s) at 100 °C Solid volume fraction W n Weight percentage of nanoparticles (g) W o Weight of base oil (ml) n Density of nanoparticles o Density of oil Shear stress (Pa) Shear strain (1/s) k Consistency index n Power law index r Relative viscosity of fluid nf Dynamic viscosity of nanofluid bf Dynamic viscosity of base fluid

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Section: Introductionmentioning

confidence: 99%

Experimental study on rheological properties of vegetable oils mixed with titanium dioxide nanoparticles

Shafi

Charoo

2019

J Braz. Soc. Mech. Sci. Eng.

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“…Also, while the temperature increased from minimum to maximum in the maximum volume fraction, the viscosity value lost 89% [26]. In a similar study, Ruhani et al used ZnO-Ag (50% -50%) / water hybrid nanofluid and concluded that viscosity decreases when temperature increases and increases when volume fractions increase [27]. Arasteh et al observed the effects of different volume fractions on PEC number, average Nusselt number, and friction coefficients using water-graphene nanoplate/ platinum hybrid nanofluid.…”

Section: Introductionmentioning

confidence: 96%

Comparison of effects of nanofluid utilization (Al2O3, SiO2, TiO2) with reference water in automotive radiators on exergetic properties of diesel engines

2021

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In this study, nanofluids formed by using ethylene glycol and three kinds of nanoparticles such as Al2O3, SiO2, and TiO2 were added to the four-stroke internal combustion engine radiator and compared with the conventional coolant (pure water). This comparison is based on the exergy performances which are the main theme of the second law of thermodynamics. The tests were carried out at a fixed engine speed of 1800 rpm using diesel fuel, and the outputs were obtained from the test setup experimentally. A total of six nanofluid tests were performed on two different dispersions (0.2% and 0.4%). As a result of this study, the best exergy efficiency was obtained by using TiO2 particles with a 35.67% value. Increasing the percentage of nanoparticles in the fluid from 0.2 to 0.4 positively affected efficiency. Pure water generally lagged behind nanofluid performance in experimental parameters. Compared to conventional coolant (pure water), the lowest exhaust temperature value was measured by using an Al2O3/Ethylene Glycol mixture with a difference of 59 K. Also, by using Al2O3 nanoparticles as a coolant, 8.858 kW of exergy exhaust value was obtained. This is the best emission value measured in the experimental study. While calculating values close to each other in the use of other nanoparticles, the worst exergy exhaust results were obtained by using the conventional refrigerant. Consequently, in this paper, exergetic outputs such as exergetic efficiency, exergy destruction, exergy heat, exergy work, exergy total exhaust, and entropy production rate were calculated for pure water and each nanofluid.

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“…It has been reported that HNFs show superior thermal conductivity as well as performance than mono nanofluids 17,18,21‐24 . Many research studies have been reported on hybrid nanofluids to study the impact on thermophysical properties including rheological properties, 25‐28 thermophysical properties, 29‐31 optical properties, and performance evaluation of heat transfer systems 32 including solar collectors 33‐35 …”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that HNFs show superior thermal conductivity as well as performance than mono nanofluids. 17,18,[21][22][23][24] Many research studies have been reported on hybrid nanofluids to study the impact on thermophysical properties including rheological properties, [25][26][27][28] thermophysical properties, [29][30][31] optical properties, and performance evaluation of heat transfer systems 32 including solar collectors. [33][34][35] Diverse range of mono and hybrid nanofluids based on Therminol-55 oil, thermal fluids, water, and ethylene glycol doped with metallic nanoparticles and their oxides have been studied for use in solar collectors for varied temperature range.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on thermal conductivity of mono and hybrid Al ₂ O ₃ –TiO ₂ nanofluids for concentrating solar collectors

2020

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Summary Hybrid nanofluids with Therminol‐55 as base fluid and TiO2 and Al2O3 as nano additives are investigated for parabolic trough collectors. Stable mono nanofluids based on Therminol‐55 with Al2O3 and TiO2 nanoparticles, and hybrid Al2O3–TiO2 nanopowder as additives are prepared by the two‐step method. Oleic acid has been made as a surfactant. The impact of nanoparticle content and fluid temperature on thermal conductivity was studied using the transient hot‐wire technique. Thermal conductivity exhibited an increase with an increase in both temperature and nanoparticle concentration. Al2O3–TiO2 Therminol‐55 hybrid nanofluids exhibit the highest increase of 33.5% in thermal conductivity followed by 27.06% in Al2O3–Therminol‐55, and lowest rise of 21% is found in TiO2–Therminol‐55 nanofluids. Synergetic effect of Al2O3 and TiO2 nanoparticles, increased Brownian motion, and filling of vacant spaces by smaller‐sized TiO2 nanoparticles in Al2O3–TiO2 hybrid nanofluids lead to effective thermal network for enhanced thermal conductivity. Maximum thermal conductivity of 0.15 W/m‐K is observed in the case of hybrid Al2O3–TiO2 Therminol‐55 nanofluid with 0.5 wt% concentration. Augmented thermal conductivity of HNF's leads to the efficient photothermal conversion in concentrating solar collectors. Further, a correlation for thermal conductivity with variation in nanoparticle content and the fluid temperature is proposed with R2 = 0.92.

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Statistical investigation for developing a new model for rheological behavior of ZnO–Ag (50%–50%)/Water hybrid Newtonian nanofluid using experimental data

Cited by 153 publications

References 74 publications

Experimental study on rheological properties of vegetable oils mixed with titanium dioxide nanoparticles

Experimental study on rheological properties of vegetable oils mixed with titanium dioxide nanoparticles

Comparison of effects of nanofluid utilization (Al2O3, SiO2, TiO2) with reference water in automotive radiators on exergetic properties of diesel engines

Experimental study on thermal conductivity of mono and hybrid Al ₂ O ₃ –TiO ₂ nanofluids for concentrating solar collectors

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Statistical investigation for developing a new model for rheological behavior of ZnO–Ag (50%–50%)/Water hybrid Newtonian nanofluid using experimental data

Cited by 153 publications

References 74 publications

Experimental study on rheological properties of vegetable oils mixed with titanium dioxide nanoparticles

Experimental study on rheological properties of vegetable oils mixed with titanium dioxide nanoparticles

Comparison of effects of nanofluid utilization (Al2O3, SiO2, TiO2) with reference water in automotive radiators on exergetic properties of diesel engines

Experimental study on thermal conductivity of mono and hybrid Al 2 O 3 –TiO 2 nanofluids for concentrating solar collectors

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Experimental study on thermal conductivity of mono and hybrid Al ₂ O ₃ –TiO ₂ nanofluids for concentrating solar collectors