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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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TL;DR: In this article, the authors provide an overview of the various possible mechanisms reported in the literature that contribute to enhanced thermal conductivity of nanofluids and discuss the existing controversies in them.
Abstract: Due to superior thermal properties and many potential applications, nanofluids have recently attracted the attention of the research community. Though the experiments in nanofluids have revealed the spectacular heat transfer enhancement in them, there are many inconsistencies in the reported experimental values and controversies in the mechanisms proposed for heat transport in nanofluids. This indicates that it is crucial to be aware of the different mechanisms contributing to superior thermal properties of nanofluids and discuss the existing controversies in them. Therefore, in this article, we provide an overview of the various possible mechanisms reported in the literature that contribute to enhanced thermal conductivity of nanofluids. The other factors affecting the nanofluids thermal conductivity and the mathematical models for estimating nanofluids thermal conductivity with their limitations are also discussed.

187 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of nanoparticles on thermal efficiency, entropy generation, heat transfer coefficient enhancement, as well as pressure drop in parabolic trough collectors (PTCs) has been investigated.
Abstract: The present review paper aims to document the latest developments on the applications of nanofluids as working fluid in parabolic trough collectors (PTCs). The influence of many factors such as nanoparticles and base fluid type as well as volume fraction and size of nanoparticles on the performance of PTCs has been investigated. The reviewed studies were mainly categorized into three different types of experimental, modeling (semi-analytical), and computational fluid dynamics (CFD). The main focus was to evaluate the effect of nanofluids on thermal efficiency, entropy generation, heat transfer coefficient enhancement, as well as pressure drop in PTCs. It was revealed that nanofluids not only enhance (in most of the cases) the thermal efficiency, convection heat transfer coefficient, and exergy efficiency of the system but also can decrease the entropy generation of the system. The only drawback in application of nanofluids in PTCs was found to be pressure drop increase that can be controlled by optimization in nanoparticles volume fraction and mass flow rate.

186 citations

Journal ArticleDOI
TL;DR: In this article, the natural convection of a CuO-water nanofluid in a permeable cavity is simulated using the Darcy law and the Brownian motion impact on the properties of the nanophase is taken into account using the KKL model.
Abstract: The natural convection of a CuO-water nanofluid in a permeable cavity is simulated using the Darcy law. The Brownian motion impact on the properties of the nanofluid is taken into account using the KKL model. The effect of Lorentz forces on the nanofluid hydrothermal behavior are considered. The control volume based finite element method is applied to solve the final equations. Roles of CuO-water volume fraction ( $\phi$ ), Rayleigh (Ra) and Hartmann (Ha) numbers for a porous medium are reported. Results show that the Nusselt number decreases with increasing Ha but it increases with increasing $\phi$ , Ra.

186 citations

Journal ArticleDOI
TL;DR: In this article, an experimental investigation of a nanofluid oscillating heat pipe (OHP) was conducted to determine the effect of nanoparticles on the heat transport capability in an OHP.
Abstract: An experimental investigation of a nanofluid oscillating heat pipe (OHP) was conducted to determine the nanofluid effect on the heat transport capability in an OHP. The nanofluid consisted of HPLC grade water and 1.0 vol % diamond nanoparticles of 5-50 nm. These diamond nanoparticles settle down in the motionless base fluid. However, the oscillating motion of the OHP suspends the diamond nanoparticles in the working fluid. Experimental results show that the heat transport capability of the OHP significantly increased when it was charged with the nanofluid at a filling ratio of 50%. It was found that the heat transport capability of the OHP depends on the operating temperature. The investigated OHP could reach a thermal resistance of 0.03° C/W at a heat input of 336 W. The nanofluid OHP investigated here provides a new approach in designing a highly efficient next generation of heat pipe cooling devices.

186 citations

Journal ArticleDOI
TL;DR: In this article, the stagnation point flow of nanofluid with magneto-hydrodynamics (MHD) and thermal radiation effects passed over a stretching sheet has been investigated.
Abstract: Present model is devoted for the stagnation point flow of nanofluid with magneto-hydrodynamics (MHD) and thermal radiation effects passed over a stretching sheet. Moreover, we have considered the combined effects of velocity and thermal slip. Condition of zero normal flux of nanoparticles at the wall for the stretched flow phenomena is yet to be explored in the literature. Convinced partial differential equations of the model are transformed into the system of coupled nonlinear differential equations and then solved numerically. Graphical results are plotted for velocity, temperature and nanoparticle concentration for various values of emerging parameters. Variation of stream lines, skin friction coefficient, local Nusselt and Sherwood number are displayed along with the effective parameters. Final conclusion has been drawn on the basis of both numerical and graphs results.

186 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