Topic
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 paper, water-based nanofluids have been used to enhance the heat transfer performance of a car radiator by adding ZnO nanoparticles to base fluid in different volumetric concentrations (0.01, 0.08), 0.2% and 0.3%).
226 citations
TL;DR: In this paper, a linear stability analysis for the onset of natural convection in a horizontal nanofluid layer is presented, which incorporates the effects of Brownian motion and thermophoresis.
Abstract: This paper presents a linear stability analysis for the onset of natural convection in a horizontal nanofluid layer. The employed model incorporates the effects of Brownian motion and thermophoresis. Both monotonic and oscillatory convection for free–free, rigid–rigid, and rigid–free boundaries are investigated. The oscillatory instability is possible when nanoparticles concentrate near the bottom of the layer, so that the density gradient caused by such a bottom-heavy nanoparticle distribution competes with the density variation caused by heating from the bottom. It is established that the instability is almost purely a phenomenon due to buoyancy coupled with the conservation of nanoparticles. It is independent of the contributions of Brownian motion and thermophoresis to the thermal energy equation. Rather, the Brownian motion and thermophoresis enter to produce their effects directly into the equation expressing the conservation of nanoparticles so that the temperature and the particle density are coupled in a particular way, and that results in the thermal and concentration buoyancy effects being coupled in the same way.
226 citations
TL;DR: In this paper, a two component non-homogenous equilibrium model is used for the nanofluid that incorporates the effects of Brownian motion and thermophoresis, and variable thermal conductivity and variable viscosity are taken into account in this work.
226 citations
TL;DR: Carbon black nanofluids had good absorption ability of solar energy and can effectively enhance the solar absorption efficiency.
Abstract: In this article, carbon black nanofluids were prepared by dispersing the pretreated carbon black powder into distilled water The size and morphology of the nanoparticles were explored The photothermal properties, optical properties, rheological behaviors, and thermal conductivities of the nanofluids were also investigated The results showed that the nanofluids of high-volume fraction had better photothermal properties Both carbon black powder and nanofluids had good absorption in the whole wavelength ranging from 200 to 2,500 nm The nanofluids exhibited a shear thinning behavior The shear viscosity increased with the increasing volume fraction and decreased with the increasing temperature at the same shear rate The thermal conductivity of carbon black nanofluids increased with the increase of volume fraction and temperature Carbon black nanofluids had good absorption ability of solar energy and can effectively enhance the solar absorption efficiency
226 citations
TL;DR: In this paper, the authors evaluated the performance of nanofluid convective heat transfer and viscosity measurements and evaluated how they performed heating buildings in cold regions, and found that the heat transfer coefficient increases with volume concentration, and that using nanoparticles in heat exchangers could reduce volumetric and mass flow rates, and result in an overall pumping power savings.
226 citations