Influence of base fluid, temperature, and concentration on the thermophysical properties of hybrid nanofluids of alumina–ferrofluid: experimental data, modeling through enhanced ANN, ANFIS, and curve fitting

Giwa, Solomon O.; Sharifpur, Mohsen; Goodarzi, Marjan; Alsulami, Hamed; Meyer, Josua P.

doi:10.1007/s10973-020-09372-w

Cited by 165 publications

(52 citation statements)

References 63 publications

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“…This observation is well illustrated in Figure 7 , in which the electrical conductivity was improved linearly as the temperature increased. Consequently, the electrical conductivity of the nanofluids was directly proportional to the volume concentration and temperature, which was consistent with earlier studies reported in the literature for mono-particle and hybrid nanofluids [ 14 , 38 , 45 , 46 , 47 , 48 ]. At 55 °C and 1.5 vol%, maximum electrical conductivity (4139 μS/cm) was obtained which was considerably higher than the values of 19.0 μS/cm (for Fe 3 O 4 /water nanofluid at 0.6 vol% and 60 °C) and 1127–1265 μS/cm (Al 2 O 3 -MWCNT (80:20)/DIW nanofluid at 0.1 vol% and 50 °C) reported by Bagheli et al [ 49 ] and Giwa et al [ 38 ], respectively.…”

Section: Resultssupporting

confidence: 91%

Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

et al. 2021

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The superiority of nanofluid over conventional working fluid has been well researched and proven. Newest on the horizon is the hybrid nanofluid currently being examined due to its improved thermal properties. This paper examined the viscosity and electrical conductivity of deionized water (DIW)-based multiwalled carbon nanotube (MWCNT)-Fe2O3 (20:80) nanofluids at temperatures and volume concentrations ranging from 15 °C to 55 °C and 0.1–1.5%, respectively. The morphology of the suspended hybrid nanofluids was characterized using a transmission electron microscope, and the stability was monitored using visual inspection, UV–visible, and viscosity-checking techniques. With the aid of a viscometer and electrical conductivity meter, the viscosity and electrical conductivity of the hybrid nanofluids were determined, respectively. The MWCNT-Fe2O3/DIW nanofluids were found to be stable and well suspended. Both the electrical conductivity and viscosity of the hybrid nanofluids were augmented with respect to increasing volume concentration. In contrast, the temperature rise was noticed to diminish the viscosity of the nanofluids, but it enhanced electrical conductivity. Maximum increments of 35.7% and 1676.4% were obtained for the viscosity and electrical conductivity of the hybrid nanofluids, respectively, when compared with the base fluid. The obtained results were observed to agree with previous studies in the literature. After fitting the obtained experimental data, high accuracy was achieved with the formulated correlations for estimating the electrical conductivity and viscosity. The examined hybrid nanofluid was noticed to possess a lesser viscosity in comparison with the mono-particle nanofluid of Fe2O3/water, which was good for engineering applications as the pumping power would be reduced.

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Section: Resultssupporting

confidence: 91%

Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

et al. 2021

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“…Experimental methods have been devised to check the stability of NF and HNF. These include sedimentation, centrifugation, spectral absorbency, viscosity, electron microscopy, ZP, poly-disparity index and light scattering [ 10 , 27 , 34 , 45 , 46 , 47 , 48 ]. In studies involving CHT in enclosures, the sedimentation, centrifugation, spectral absorbency, viscosity, density, ZP and poly-disparity index are mostly engaged to check the stability of NF and HNF [ 15 , 16 , 36 , 49 , 50 , 51 ].…”

Section: Formulation and Stability Of Mono-particle And Hybrid Nanmentioning

confidence: 99%

“…to prepare NF, and they reported various degrees of enhancements under diverse ranges of temperatures and volume/mass fractions or concentrations. The literature revealed the enhancement of TC of NF in comparison with the respective base fluids as the temperature and volume/mass fraction or concentration increased [ 12 , 48 , 59 , 80 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 ]. The influence of magnetic field on the TC of NF has been investigated by a few researchers [ 91 , 92 , 93 , 96 , 97 , 98 , 99 ].…”

Section: Thermophysical Properties Of Nanofluids and Hybrid-nanoflmentioning

confidence: 99%

“…Again, progress in research has shown that the hybridization of NP could be utilized to manipulate the viscosity of NF. The viscosity of HNF has been investigated by numerous researchers as regards temperature, volume/mass concentration or fraction and mixing ratio of HNP [ 47 , 48 , 63 , 66 , 69 , 70 , 72 , 100 , 104 , 117 , 118 ]. Similarly to NF, the viscosity of HNF enhanced with volume/mass concentration or fraction and detracted with temperature.…”

Section: Thermophysical Properties Of Nanofluids and Hybrid-nanoflmentioning

confidence: 99%

“…The current trend of investigations on NF has established that the thermal and convective properties of NF can be improved through the utilization of HNF and an external magnetic field [ 48 , 55 , 76 , 150 ]. Thus, HNF as a passive method and a magnetic field as an active technique have been studied for possible augmentation of convective heat transfer of nano-engineered fluids in different square geometries.…”

Section: Convective Heat Transfer Performance Of Nanofluidsmentioning

confidence: 99%

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Experimental Research and Development on the Natural Convection of Suspensions of Nanoparticles—A Comprehensive Review

et al. 2020

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Suspensions of nanoparticles, widely known as nanofluids, are considered as advanced heat transfer media for thermal management and conversion systems. Research on their convective thermal transport is of paramount importance for their applications in such systems such as heat exchangers and solar collectors. This paper presents experimental research on the natural convection heat transfer performances of nanofluids in different geometries from thermal management and conversion perspectives. Experimental results and available experiment-derived correlations for the natural thermal convection of nanofluids are critically analyzed. Other features such as nanofluid preparation, stability evaluation and thermophysical properties of nanofluids that are important for this thermal transfer feature are also briefly reviewed and discussed. Additionally, techniques (active and passive) employed for enhancing the thermo-convection of nanofluids in different geometries are highlighted and discussed. Hybrid nanofluids are featured in this work as the newest class of nanofluids, with particular focuses on the thermophysical properties and natural convection heat transfer performance in enclosures. It is demonstrated that there has been a lack of accurate stability evaluation given the inconsistencies of available results on these properties and features of nanofluids. Although nanofluids exhibit enhanced thermophysical properties such as viscosity and thermal conductivity, convective heat transfer coefficients were observed to deteriorate in some cases when nanofluids were used, especially for nanoparticle concentrations of more than 0.1 vol.%. However, there are inconsistencies in the literature results, and the underlying mechanisms are also not yet well-understood despite their great importance for practical applications.

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Experimental and Theoretical Investigations of the Thermal Conductivity of Erbium Oxide/Ethylene Glycol Nanofluids for Thermal Energy Applications

et al. 2022

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The thermal conductivity of Er2O3/ethylene glycol (EG) nanofluids was investigated at different concentrations of Er2O3 nanoparticles in the temperature range of 20–50 °C. The findings showed that the volume fraction of Er2O3 nanoparticles and temperature affect the thermal conductivity. The thermal conductivity increases with increasing Er2O3 concentration and temperature, and the Er2O3/EG nanofluid showed higher thermal conductivity than the base fluid. Precise correlations are proposed to forecast the thermal conductivity of the Er2O3/EG nanofluid relative to the base fluid. These results are promising for using Er2O3/EG nanofluid in solar thermal applications.

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Influence of base fluid, temperature, and concentration on the thermophysical properties of hybrid nanofluids of alumina–ferrofluid: experimental data, modeling through enhanced ANN, ANFIS, and curve fitting

Cited by 165 publications

References 63 publications

Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

Experimental Research and Development on the Natural Convection of Suspensions of Nanoparticles—A Comprehensive Review

Experimental and Theoretical Investigations of the Thermal Conductivity of Erbium Oxide/Ethylene Glycol Nanofluids for Thermal Energy Applications

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