Enhancing thermal conductivity of fluids with nano-particles
01 Jan 1995-Vol. 231, pp 99-105
About: The article was published on 1995-01-01 and is currently open access. It has received 7263 citations till now. The article focuses on the topics: Thermal conductivity & Nanoparticle.
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TL;DR: In this paper, the study of electrically conducting micropolar nanofluids flow over a stretching sheet influencing by thermal radiation and non-uniform heat source/sink in presence of transverse magnetic field investigated numerically and simulated with RungeKutta-Fehlberg method with shooting techniques.
92 citations
TL;DR: In this paper, an experimental study was carried out in order to find out the effects of Al2O3 nanofluid with a mean diameter of 20nm on heat transfer, pressure drop and thermal performance of a double tubes heat exchanger.
92 citations
TL;DR: In this article, the combined effects of viscous dissipation and Newtonian heating on boundary-layer flow over a flat plate for three types of water-based nanofluids containing metallic or nonmetallic nanoparticles such as copper (Cu), alumina (Al2O3), and titania (TiO2) for a range of nanoparticle volume fractions were investigated.
Abstract: Purpose – The purpose of this paper is to investigate the combined effects of viscous dissipation and Newtonian heating on boundary-layer flow over a flat plate for three types of water-based nanofluids containing metallic or nonmetallic nanoparticles such as copper (Cu), alumina (Al2O3), and titania (TiO2) for a range of nanoparticle volume fractions. Design/methodology/approach – The governing partial differential equations are transformed into ordinary differential equations using a similarity transformation, before being solved numerically by a Runge-Kutta-Fehlberg method with shooting technique. Findings – It is found that the heat transfer rate at the plate surface increases with increasing nanoparticle volume fraction and Biot number, while it decreases with the Brinkmann number. Moreover, the heat transfer rate at the plate surface with Cu-water nanofluid is higher than that of Al2O3-water and TiO2-water nanofluids. Practical implications – The heat transfer enhancement performances presented by n...
91 citations
TL;DR: An interfacial layer, competing with Brownian motion as a corresponding mechanism, is conceptually connected with the surface-charge-induced electrical double layer by applying colloidal science, and the first explicit equations for the thickness and thermal conductivity of the layer are obtained.
Abstract: Although recent experiments have revealed that nanofluids have superior thermal conductivities to base fluids, the inherent physics are not fully understood. In this study, an interfacial layer, competing with Brownian motion as a corresponding mechanism, is conceptually connected with the surface-charge-induced electrical double layer. By applying colloidal science, the first explicit equations for the thickness and thermal conductivity of the layer are obtained. A fractal model including the new concept of the layer is developed. The model predictions are compared with experimental data for effects of pH, temperature, volume fraction, and primary particle size of CuO-water nanofluids.
91 citations
TL;DR: In this article, the steady mixed convection flow along a vertical surface embedded in a porous medium with hybrid nanoparticles is examined, and the similarity equations are obtained from the governing equations using the similarity variables, and their solutions are obtained by the aid of the bvp4c solver.
91 citations