A review on preparation methods, stability and applications of hybrid nanofluids

Sidik, Nor Azwadi Che; Jamil, Muhammad; Japar, Wan Mohd Arif Aziz; Adamu, Isa Muhammad

doi:10.1016/j.rser.2017.05.221

Cited by 285 publications

(88 citation statements)

References 108 publications

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“…Kumar et al [17] reported in the comprehensive study that most researchers commonly used a two-step method than a one-step method in nanofluid manufacturing because the one-step method requires more complicated processes and expensive reagents. However, according to Sidik et al [18], the one-step method is suitable for small-scale production although a two-step method was less expensive for mass production.…”

Section: Introductionmentioning

confidence: 99%

Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid

2019

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Multiwalled carbon nanotubes (MWCNTs) have attracted attention from researchers because of their superior thermal properties and high optical absorption. In this investigation, the thermal and optical properties of functionalized and nonfunctionalized MWCNT nanofluid based on ethylene glycol/water were experimentally studied and compared. The results indicated that the use of the functionalized MWCNT nanofluid improved the thermal properties and optical absorption performance compared with the nonfunctionalized MWCNT nanofluid. The thermal conductivity enhancement of the functionalized MWCNT nanofluid was higher than that of the nonfunctionalized MWCNT nanofluid. The maximum thermal conductivity enhancement (10.15%) was observed in a functionalized MWCNT concentration of 0.01 wt% at 50 °C compared with the base fluid. In addition, the photo-thermal energy conversion efficiency of the functionalized MWCNT nanofluid was higher than that of the nonfunctionalized one owing to its higher light absorption and thermal conductivity.

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Section: Introductionmentioning

confidence: 99%

Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid

2019

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“…Small size of nanoparticles enables them to interact easily with the base fluids and enhance thermal conductivity of the resulting nanofluids. Thermal performance of non-concentrating collectors employing nanofluids, using water or water-based mixtures as base-fluids, has shown very encouraging results [3]. However, non-concentrating collectors are only suitable for low temperature (< 100 8C) applications.…”

Section: Introductionmentioning

confidence: 99%

Characterization and stability analysis of oil‐based copper oxide nanofluids for medium temperature solar collectors

Akhter

Gilani

Al-Kayiem

et al. 2019

Materialwissenschaft Werkst

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Thermal oils are widely used as heat transfer fluids in medium temperature applications. Addition of small amounts of nanoparticles in such fluids can significantly improve their thermophysical properties. This paper presents experimental investigation of an oil‐based nanofluids prepared by dispersing different concentrations (0.25 wt%–1.0 wt%) of copper oxide nanoparticles in Therminol‐55 oil using two‐step method. Shear mixing and ultrasonication were used for uniform distribution and de‐agglomeration of nanoparticles to enhance the stability of the suspensions. The effect of nanoparticles concentrations on thermophysical properties of the nanofluids was analysed by measuring thermal conductivity, dynamic viscosity, effective density and specific heat capacity at different temperatures (25 °C–130 °C). Thermal conductivity exhibited increasing trend with rising temperature and increase in nanoparticles loading. A significant decrease in dynamic viscosity and effective density against increasing temperature makes it suitable for medium temperature applications. Nano‐oils with improved thermal properties are expected to increase the efficiency of concentrating solar thermal collectors.

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“…Moreover, the addition of nanoscale particles to NFs can result in considerably lower pressure drops, blocks, wear, and energy consumption in heat exchange system pipelines, thereby improving the availability of NFs. Therefore, NFs have numerous potential applications in engineering, especially in the fields of electromechanics, air conditioning, automobiles, manufacturing, machining, solar energy, building structures, and biomedicine [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The concentration and particle size distribution of the NFs produced in the two-step method can be easily controlled; however, these NFs have low stability. Therefore, it is crucial to improve the long-term stability of NFs by adding 2 Journal of Nanomaterials dispersants and conducting pH control, mechanical stirring, and dispersion [5,11].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Carbon-Based Nanofluids through the Water Vortex Trap Method

Cheng

Teng

2018

Journal of Nanomaterials

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This study designed an efficient one-step method for synthesizing carbon-based nanofluids (CBNFs). The method employs the vortex trap method (VTM) and an oxygen-acetylene flame, serving as a carbon source, in a manufacturing system of the VTM (MSVTM). The flow rate ratio of O 2 and C 2 H 2 was adjusted to form suitable combustion conditions for the reduced flame. Four flow rate ratios of O 2 and C 2 H 2 were used: 1.5 : 2.5 (V1), 1.0 : 2.5 (V2), 0.5 : 2.5 (V3), and 0 : 2.5 (V4). The morphology, structure, particle size, stability, and basic physicochemical characteristics of the obtained carbon-based nanomaterials (CBNMs) and CBNFs were investigated using transmission electron microscopy, field-emission scanning electron microscopy, X-ray diffraction, Raman spectrometry, ultraviolet-visible-near-infrared spectrophotometry, and a particle size-zeta potential analyzer. The static positioning method was utilized to evaluate the stability of the CBNFs with added EP dispersants. The evaluation results revealed the morphologies, compositions, and concentrations of the CBNFs obtained using various process parameters, and the relation between processing time and production rate was determined. Among the CBNMs synthesized, those obtained using the V4-0 flow rate ratio had the highest stability when no EP dispersant was added. Moreover, the maximum enhancement ratios of the viscosity and thermal conductivity were also obtained for V4-0: 4.65% and 1.29%, respectively. Different types and concentrations of dispersants should be considered in future research to enhance the stability of CBNFs for further application.

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A review on preparation methods, stability and applications of hybrid nanofluids

Cited by 285 publications

References 108 publications

Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid

Comparison Study on Photo-Thermal Energy Conversion Performance of Functionalized and Non-Functionalized MWCNT Nanofluid

Characterization and stability analysis of oil‐based copper oxide nanofluids for medium temperature solar collectors

Fabrication and Characterization of Carbon-Based Nanofluids through the Water Vortex Trap Method

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