Thermal conductivity and rheological studies for Cu–Zn hybrid nanofluids with various basefluids

Kumar, Mechiri Sandeep; Vasu, V.; Gopal, A. Venu

doi:10.1016/j.jtice.2016.05.033

Cited by 111 publications

(27 citation statements)

References 21 publications

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“…Other measured properties of NF are flashpoint [ 51 ], contact angle [ 134 ], volumetric heat capacity [ 115 ], breakdown voltage [ 51 ], surface tension [ 135 ], extinction coefficient and transmittance [ 33 ] and shear stress [ 135 ], while those of HNF are flashpoint [ 68 ] and surface tension [ 47 ].…”

Section: Thermophysical Properties Of Nanofluids and Hybrid-nanoflmentioning

confidence: 99%

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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Section: Thermophysical Properties Of Nanofluids and Hybrid-nanoflmentioning

confidence: 99%

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

et al. 2020

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“…The results showed that the ANN technique was the most suitable and accurate in comparison of the developed model. Sharma et al [120] examined the viscosity of hybrid nanofluids prepared using different combination of nanoparticles like (0.8 CeO -0. MWCNT/10W40 and found that the developed model used for the prediction of nanofluids viscosity failed to predict the values for cases of hybrid nanofluids.…”

Section: → [87]mentioning

confidence: 99%

Viscosity of hybrid nanofluids: A critical review

2019

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The remarkable enhancement in heat transfer capabilities of conventional fluids with the addition of nanosized metallic and non-metallic particles appealed the attention of investigators towards the suspension of hybrid nanocomposites as a substitute of mono particles. Although these fluids manifest captivating thermal characteristics, the drawbacks associated with their application include high frictional effects and pumping power requirements. The major cause of aforementioned problems is the elevated viscosity. The current study summarizes the work of different investigators and discusses the critical factors affecting the viscosity of hybrid nanofluids such as temperature, particle concentration, pH value, particle size and morphology with a concise discussion on the reasons reported in the literature for the viscosity augmentation. Furthermore, the models developed by different investigators have also been discoursed with specified limitations. Comparison between the viscosity of mono and hybrid nanofluid is also presented comprehensively. It is observed that most of the studies considered the effect of particle concentration and temperature that the effect of these factors is more significant. Water-based nanofluids delivered better results in comparison of ethylene glycol-based nanofluids while the oil-based nanofluids preferred in the applications where the pumping power is not more significant. It has been noticed that the fluids containing tube shaped nanoparticles comparatively showed enhanced viscosity than that of spherically shaped nanoparticles. It has also been observed that the studies preferred to develop their own models for the prediction of viscosity rather than to use the existing models and failed to provide a universal correlation.

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“…Conventional surfactants has been used by many researchers. Some of the conventional surfactants include: Sodium Dodecylbenzene Sulfonate (SDBS) [53], Sodium Dodecyl Sulfate (SDS) [54], Cetyl Trimethyl Ammonium Bromide (CTAB) [55] and Polyvinyl Pyrrolidone (PVP) [53]. Paramashivaiah and Rajashekjar reported that SDBS performs better than SDS for stable dispersion of graphene/simarouba biodiesel nanofluid [56].…”

Section: Addition Of Surfactants1mentioning

confidence: 99%

A review on thermo-physical properties of bio, non-bio and hybrid nanofluids

Chen¹,

Oumer²,

Aziz³

2019

JMES

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The pressure drop and thermal performance of various nanofluids can be affected by their thermo-physical properties. However, there are many different parameters that need to be considered when determining the thermo-physical properties of nanofluids. This paper highlights a detail reviews on the thermo-physical properties of nanofluids with different material type and effect of some process parameters (such as material type, temperature and concentration) on the thermo-physical properties of nanofluids. Four thermo-physical properties mainly density, viscosity, thermal conductivity and specific heat capacity from different literatures were summarized, discussed and presented. The lowest viscosity value of nanofluids in literature was mango bark water-based nanofluid (0.81cP). On the other hand, the maximum thermal conductivity value of nanofluids in the literature was GNP-Ag water-based nanofluid (0.69W/mK). The density and specific heat capacity are strongly dependent on the material type. Meanwhile, the viscosity and thermal conductivity are greatly affected by temperature and concentration. The most influential parameters on thermo-physical properties of nanofluids are material type followed by temperature. Most of the literatures confirmed bio nanofluids have low viscosity value and hybrid have high thermal conductivity values.

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Thermal conductivity and rheological studies for Cu–Zn hybrid nanofluids with various basefluids

Cited by 111 publications

References 21 publications

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

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

Viscosity of hybrid nanofluids: A critical review

A review on thermo-physical properties of bio, non-bio and hybrid nanofluids

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