An investigation of carbon nanotubes on shear stress, thermal conductivity and the viscosity of Nanofluids

Document Type : Original Research Paper

Author

Department of chemistry, Faculty of Science, Payamenoor University, Tehran, Iran.

10.22034/jna.2022.680846

Abstract

The Nanofluid includes suspensions containing nanoparticles, which are dispersed
in the base fluid homogeneously. In this study, nanoparticles called multi-walled
carbon nanotubes (MWCNT) were dispersed in a pure water-based fluid. The shape,
size, and arrangement of carbon nanotubes were displayed by the transmittance
electron microscope (TEM) and scanning electron microscope (SEM) techniques.
The thermal conductivity and viscosity of the resulting nanofluid were measured
experimentally. The carbon nanotubes within the nanofluid were stabilized using
Sodium dodecyl benzene sulphate. The effect of carbon nanotubes on shear
stress, thermal conductivity and viscosity of fluids has investigated. The results
showed that at 308K the thermal conductivity was increased from 0.6 to 0.94
w/m.ºC with an increase in the volumetric concentration of MWCNTs from 0 to
0.015%. And the thermal conductivity was increased from 0.74 to 0.94 w/m.ºC
with increase in temperature from 298 to 308K. The shear stress was increased
from 10.8 to 11.9 N/m2 at 298K by increase in the volumetric concentration
of MWCNTs from 0 to 0.015% and it was reduced from 11.9 to 9.2 N/m2 with
enhance in temperature from 298 to 308K, respectively.

Keywords