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19Fax: +33 (0) 2 23 23 40 51 20 21Abstract: 22 23Experimental results on the steady state viscosity of carbon nanotubes water-based nanofluids 24 are presented considering the influence of particle volume fraction and temperature ranging 25 from 0 to 40°C. The suspensions consist of multi-walled carbon nanotubes dispersed in de-26 ionized water and they are stabilized by a surfactant. The aspect ratio of nanotubes is close to 27 160 and the particle volume fraction varies between 0.0055% and 0.55%. It is shown that the 28 nanofluids behave as shear-thinning materials for high particle content. For lower particle 29 content, the nanofluids are quite Newtonian. It is also observed that the relative viscosity of 30