Thermal conductivity, viscosity, and optical properties of nanofluids based on water and carbon nanoparticles
A.V. Zaikovsky1, A.M. Dmitrachkov2,3, M.A. Morozova1
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
3Novosibirsk State University, Novosibirsk, Russia
Keywords: carbon nanoparticles, nanofluid, thermal conductivity, viscosity, extinction
Abstract
The present study deals with optical and thermophysical properties of nanofluids based on spherical carbon nanoparticles stabilized in water by sodium dodecyl sulfate. Nanoparticles with the mean diameter of 11 nm are synthesized by means of electric arc spraying in helium at a pressure of 3 Torr. For the concentration of carbon nanoparticles in the nanofluid equal to 0.01%, the extinction coefficient varies from 400 to 200 m-1 in the wavelength range of 180 - 1100 nm. For mass fractions of nanoparticles within 0 - 0.04%, the viscosity is not found to depend on the concentration. With an increase in the concentration, the thermal conductivity of nanofluids in the same range of concentrations is found to be lower than the thermal conductivity of water by up to 4%.
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