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Article
Experimental and numerical investigation of heat transfer in CNT nanofluids
Journal of Experimental Nanoscience (2015)
Abstract

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. Link to Full-Text Articles : http://www.tandfonline.com/doi/abs/10.1080/17458080.2013.848296

Keywords
  • computational fluid dynamics,
  • thermal conductivity,
  • density,
  • heat transfer,
  • rheology,
  • thermal-conductivity enhancement,
  • carbon nanotubes,
  • aqueous suspensions,
  • laminar-flow,
  • behavior,
  • tube,
  • dispersions,
  • performance,
  • sink
Publication Date
May 3, 2015
Publisher Statement
Cb3pi Times Cited:1 Cited References Count:43
Citation Information
"Experimental and numerical investigation of heat transfer in CNT nanofluids" Journal of Experimental Nanoscience Vol. 10 Iss. 7 (2015)
Available at: http://works.bepress.com/facultyofengineering_universityofmalaya/105/