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Nitrogen-doped carbon nanotubes for heat transfer applications

Enhancement of conduction and convection properties of water/N-CNT nanofluid
  • Mohammad Bazmi
  • Saeed Askari
  • Ebrahim Ghasemy
  • Alimorad RashidiEmail author
  • Ehsanollah Ettefaghi
Article
  • 18 Downloads

Abstract

In this research, it is aimed to enhance the heat transfer properties of the carbon nanotubes through nitrogen doping. To this end, nitrogen-doped multiwall carbon nanotubes (N-CNTs) were synthesized via chemical vapor deposition method. For supplying carbon and nitrogen during the synthesis of N-CNTs, camphor and urea were used, respectively, at 1000 °C over Co–Mo/MgO nanocatalyst in a hydrogen atmosphere. N-CNTs with three different nitrogen loadings of 0.56, 0.98, and 1.38 mass% were synthesized, after which, water/N-CNT nanofluids of these three samples with concentrations of 0.1, 0.2, and 0.5 mass% were prepared. To obtain a stable nanofluid, N-CNTs were functionalized by nitric acid followed by stabilizing in water by employing the ultrasonic bath. Investigation on the stability of the samples showed a high stability level for the prepared water/N-CNT nanofluids in which the zeta potential of − 43.5 mV was obtained for the best sample. Also for studying the heat transfer properties, the thermal conductivity in the range of 0.1–0.5 mass% and convection heat transfer coefficients of nanofluids in the range of 0.1–0.5 mass%, and Reynolds number in the range of 4000–9000 were evaluated. The results showed 32.7% enhancement of the convection heat transfer coefficients at Reynolds number of 8676 and 27% increase in the thermal conductivity at 0.5 mass% and 30 °C.

Keywords

Nitrogen-doped carbon nanotubes Nanofluid Rheological properties Thermal conductivity Heat transfer 

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Faculty of Chemical EngineeringAmirkabir University of TechnologyTehranIran
  2. 2.Nanotechnology Research CenterResearch Institute of Petroleum Industry (RIPI)TehranIran
  3. 3.Chemical Engineering DepartmentSharif University of TechnologyTehranIran

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