Journal
JOURNAL OF EXPERIMENTAL NANOSCIENCE
Volume 10, Issue 7, Pages 545-563Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17458080.2013.848296
Keywords
computational fluid dynamics; thermal conductivity; density; heat transfer; rheology
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Nanofluids with their enhanced thermal conductivity are believed to be a promising coolant in heat transfer applications. In this study, carbon nanotube (CNT) nanofluids of 0.01wt%, stabilised by 1.0wt% gum arabic were used as a cooling liquid in a concentric tube laminar flow heat exchanger. The flow rate of cold fluid varied from 10 to 50g/s. Both experimental and numerical simulations were carried out to determine the heat transfer enhancement using CNT nanofluids. Computational fluid dynamics (CFD) simulations were carried out using Fluent v 6.3 by assuming single-phase approximation. Thermal conductivity, density and rheology of the nanofluid were also measured as a function of temperature. The results showed thermal conductivity enhancement from 4% to 125% and nearly 70% enhancement in heat transfer with increase in flow rate. Numerical results exhibited good agreement with the experimental results with a deviation of [GRAPHICS] . CNT nanofluids at 0.01wt% CNTs showed Newtonian behaviour with no significant increase in the density.
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