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Nanofluid

About: Nanofluid is a research topic. Over the lifetime, 23986 publications have been published within this topic receiving 677384 citations.


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Journal ArticleDOI
TL;DR: In this paper, the thermal conductivity of CuO nanofluid was investigated by transforming an unstable Cu(OH)2 precursor to CuO in water under an ultrasonic vibration, followed by microwave irradiation.
Abstract: CuO nanofluid was synthesized by transforming an unstable Cu(OH)2 precursor to CuO in water under an ultrasonic vibration, followed by microwave irradiation. The influences of the type of precursor, ultrasonic vibration, microwave irradiation, and dispersant were studied. The thermal conductivity of CuO nanofluid was investigated. The results show that well-dispersed CuO nanofluid with high volume fractions can be synthesized using the current method. The synthesis mechanism is proposed. The current CuO nanofluid has a higher thermal conductivity than those prepared by the dispersing method.

197 citations

Journal ArticleDOI
TL;DR: In this article, the authors derived the heat conduction mechanism in nanofluid suspensions for transient processes attempting to explain experimental results, which reveal an impressive heat transfer enhancement, and the effect of the surface area-to-volume ratio (specific area) of the suspended nanoparticles on the heat transfer mechanism is explicitly accounted for, and reveals its contribution to the specific solution and results.
Abstract: The heat conduction mechanism in nanofluid suspensions is derived for transient processes attempting to explain experimental results, which reveal an impressive heat transfer enhancement. In particular, the effect of the surface-area-to-volume ratio (specific area) of the suspended nanoparticles on the heat transfer mechanism is explicitly accounted for, and reveals its contribution to the specific solution and results. The present analysis might provide an explanation that settles an apparent conflict between the recent experimental results in nanofluid suspensions and classical theories for estimating the effective thermal conductivity of suspensions that go back more than one century (Maxwell, J.C., 1891, Treatise on Electricity and Magnetism). Nevertheless, other possible explanations have to be accounted for and investigated in more detail prior to reaching a final conclusion on the former explanation.

197 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of Brownian motion and thermophoresis have been included in the model of nanofluid and the basic partial differential equations are reduced to ordinary differential equations which are solved numerically using the fourth-order Runge-Kutta method.

197 citations

Journal ArticleDOI
TL;DR: A nanofluid of graphene-based Janus amphiphilic nanosheets for enhanced oil recovery with efficiency of about 15.2%, comparable to chemical methods, which is both economically and environmentally beneficial to the petroleum industry.
Abstract: The current simple nanofluid flooding method for tertiary or enhanced oil recovery is inefficient, especially when used with low nanoparticle concentration. We have designed and produced a nanofluid of graphene-based amphiphilic nanosheets that is very effective at low concentration. Our nanosheets spontaneously approached the oil–water interface and reduced the interfacial tension in a saline environment (4 wt % NaCl and 1 wt % CaCl2), regardless of the solid surface wettability. A climbing film appeared and grew at moderate hydrodynamic condition to encapsulate the oil phase. With strong hydrodynamic power input, a solid-like interfacial film formed and was able to return to its original form even after being seriously disturbed. The film rapidly separated oil and water phases for slug-like oil displacement. The unique behavior of our nanosheet nanofluid tripled the best performance of conventional nanofluid flooding methods under similar conditions.

197 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe a novel synthesis procedure for silver decorated functionalized hydrogen induced exfoliated graphene (Ag/HEG) and preparation of nanofluids using this material.
Abstract: In the present work we describe a novel synthesis procedure for silver decorated functionalized hydrogen induced exfoliated graphene (Ag/HEG) and preparation of nanofluids using this material. Further, thermal conductivity and convective heat transfer studies are carried out for these nanofluids. A simple chemical reduction method is implemented to synthesize uniformly coated Ag/HEG and characterized by different experimental techniques. Ag/HEG is used for making nanofluids considering the high thermal conductivity of graphene and silver nanoparticles. Ag/HEG has been dispersed in deionized water and ethylene glycol using ultrasonic agitation and proper dispersion is achieved without any surfactant. Thermal conductivity and heat transfer studies on Ag/HEG dispersed nanofluids show an enhancement in the corresponding values compared to the base fluid. The level of enhancement depends on the volume fraction and temperature at which the measurement is performed. Ag/HEG dispersed deionized water based nanofluid shows an enhancement of ∼25% for 0.05% volume fraction at 25 °C. Similarly, the heat transfer coefficient of Ag/HEG based nanofluids also shows a large enhancement compared to the base fluid. The synthesized nanofluid is stable for more than three months.

197 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232,677
20225,257
20213,659
20203,035
20192,990
20182,377