Experimental investigation on the viscosity characteristics of water based SiO2-graphite hybrid nanofluids

Dalkılıç, Ahmet Selim; Açıkgöz, Özgen; Kucukyildirim, Bedri Onur; Eker, Ayşegül Akdoğan; Lüleci, Berk; Jumpholkul, Chaiwat; Wongwises, Somchai

doi:10.1016/j.icheatmasstransfer.2018.07.007

Cited by 75 publications

(12 citation statements)

References 31 publications

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“…It was found that the impact of the material was very low, and the maximum improvements in the DV of the hybrid nanofluids with the mentioned materials were 13.015%, 13.618% and 12.559%, respectively. However, in a work by Dalkılıç et al [79] on the DV of SiO 2 -graphite/water, it was found that SiO 2 particles had more effect on the DV compared with graphite. The maximum increase in the DV was 36.12%, which was obtained for a solid fraction of 2%.…”

Section: Dynamic Viscositymentioning

confidence: 91%

“…Since the mixture ratio of the nanomaterials can affect the DV of hybrid nanofluids, similar to the TC, considering it as one of the variables would lead to improvement in the comprehensiveness of the models. For instance, Dalkılıç et al [79] used the ratio of graphite weight to silica weight in addition to the temperature and solid fraction to provide a model for the DV of SiO 2 -graphite/water for different mixture ratios of the solid materials. The average deviation of the model by using the mentioned variables as input was 6.75%.…”

Section: Proposed Models For Dynamic Viscositymentioning

confidence: 99%

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Thermophysical Properties of Hybrid Nanofluids and the Proposed Models: An Updated Comprehensive Study

et al. 2021

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Thermal performance of energy conversion systems is one of the most important goals to improve the system’s efficiency. Such thermal performance is strongly dependent on the thermophysical features of the applied fluids used in energy conversion systems. Thermal conductivity, specific heat in addition to dynamic viscosity are the properties that dramatically affect heat transfer characteristics. These features of hybrid nanofluids, as promising heat transfer fluids, are influenced by different constituents, including volume fraction, size of solid parts and temperature. In this article, the mentioned features of the nanofluids with hybrid nanostructures and the proposed models for these properties are reviewed. It is concluded that the increase in the volume fraction of solids causes improvement in thermal conductivity and dynamic viscosity, while the trend of variations in the specific heat depends on the base fluid. In addition, the increase in temperature increases the thermal conductivity while it decreases the dynamic viscosity. Moreover, as stated by the reviewed works, different approaches have applicability for modeling these properties with high accuracy, while intelligent algorithms, including artificial neural networks, are able to reach a higher precision compared with the correlations. In addition to the used method, some other factors, such as the model architecture, influence the reliability and exactness of the proposed models.

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Section: Dynamic Viscositymentioning

confidence: 91%

Section: Proposed Models For Dynamic Viscositymentioning

confidence: 99%

Thermophysical Properties of Hybrid Nanofluids and the Proposed Models: An Updated Comprehensive Study

et al. 2021

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“…Nanoparticles/Base Fluid Preparation Method [24] CuO/EG One-step method (Chemical reduction method) [25] Di-Ag/EG One-step method (Polyol method) [26] TiO2-CuO and C/EG Two-step method [27] Cu/EG and DEG Two-step method [28] SiO2-Graphite/Water Two-step method [29] Al2O3-SiO2/Water Two-step method [30] Si3N4/EG Two-step method [31] Al2O3-TiO2/NA Two-step method [32] TiO2/Water Two-step method [18] Si/Water Two-step method [33] SWCNT-MgO/EG Two-step method [34] Ag and Au/Water One-step method [35] Cu/Methanol Two-step method [36] CuO-TiO2/Water Two-step method…”

Section: Author(s)mentioning

confidence: 99%

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

Zainon

Azmi

2021

Micromachines

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Many studies have shown the remarkable enhancement of thermo-physical properties with the addition of a small quantity of nanoparticles into conventional fluids. However, the long-term stability of the nanofluids, which plays a significant role in enhancing these properties, is hard to achieve, thus limiting the performance of the heat transfer fluids in practical applications. The present paper attempts to highlight various approaches used by researchers in improving and evaluating the stability of thermal fluids and thoroughly explores various factors that contribute to the enhancement of the thermo-physical properties of mono, hybrid, and green nanofluids. There are various methods to maintain the stability of nanofluids, but this paper particularly focuses on the sonication process, pH modification, and the use of surfactant. In addition, the common techniques to evaluate the stability of nanofluids are undertaken by using visual observation, TEM, FESEM, XRD, zeta potential analysis, and UV-Vis spectroscopy. Prior investigations revealed that the type of nanoparticle, particle volume concentration, size and shape of particles, temperature, and base fluids highly influence the thermo-physical properties of nanofluids. In conclusion, this paper summarized the findings and strategies to enhance the stability and factors affecting the thermal conductivity and dynamic viscosity of mono and hybrid of nanofluids towards green nanofluids.

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“…Nabil et al [26] using (TiO 2 -SiO 2 )/ (H 2 O and EG) based hybrid nanofluid recorded an increase in dynamic viscosity by about 2% upon raising nanoparticle volume fraction from (2-3%) at a temperature of 30℃. Dalkılıç et al [28] working with (SiO 2 -Graphite/H 2 O) based hybrid nanofluid reported a sharp rise in the viscosity of the nanofluid when silica nanoparticles were suspended in the base fluid as compared to graphite nanoparticles. A study by Afshari et al [29] revealed a change in properties of the nanofluid beyond 0.5vol.% concentration of nanoparticles from Newtonian to pseudoplastic non-Newtonian.…”

Section: Nanoparticle Volume Fraction and Viscosity Of Nanofluidsmentioning

confidence: 99%

A Review of Nanofluids Synthesis, Factors Influencing Their Thermophysical Properties and Applications

Okello

Mutuku

Oyem

2020

JERR

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Heat-generating equipment (such as transformers, computer microchips, car engines, nuclear reactors, etc.) requires an efficient cooling mechanism to safeguard them from thermal degradation and to enhance their life span. The use of Nanofluids as opposed to conventional heat transfer fluids in their cooling system is to ensure that they are properly cooled. Nanofluids display superior thermal properties and they are synthesized from nanosized materials such as metals ((Copper (Cu), Silver (Ag), Nickel (Ni), and Gold (Au)), metal oxides (( Aluminum oxide (Al2O3), Cupric oxide (CuO), Magnesium oxide (MgO), Zinc oxide (ZnO), Silica (SiO2), Iron (III) oxide (Fe2O3), and Titania (TiO2)), metal carbide (such as Silicon carbide (SiC)), metal nitride (such as Aluminium nitride (AIN)), or Carbon materials ((Carbon nanotubes (CNTs), Multi-wall carbon nanotubes (MWCNTs), diamond, and graphite)) suspended in base fluids (such as water, ethylene glycol, engine oil, transformer oil, vegetable oil, kerosene, toluene, etc.). The current review explores methods used in the synthesis of nanofluids (One-step method, Two-step method, Solvothermal/Hydrothermal process), factors influencing their thermophysical properties (Particle volume concentration, pH, particle size, particle shape, particle material, base fluid material, temperature, shear rate, and surfactants) and their applications (Heat transfer applications, automotive applications, biomedical applications, electronic applications, Nano-based microbial fuel cells, and Nano-based brake fluids).

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Experimental investigation on the viscosity characteristics of water based SiO2-graphite hybrid nanofluids

Cited by 75 publications

References 31 publications

Thermophysical Properties of Hybrid Nanofluids and the Proposed Models: An Updated Comprehensive Study

Thermophysical Properties of Hybrid Nanofluids and the Proposed Models: An Updated Comprehensive Study

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

A Review of Nanofluids Synthesis, Factors Influencing Their Thermophysical Properties and Applications

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