Thermophysical properties of ethylene glycol mixture based CNT nanofluids

8th Brazilian Congress on Metrology

Camarano, D.M.^1 ; Mansur, F.A.^1 ; Araújo, T.L.C.F.^1 ; Salles, G.C.^1 ; Santos, A.P.^1

Nuclear Technology Development Center, CDTN, Belo Horizonte

MG

31270-901, Brazil^1

关键词: Heat transfer characteristics;    Humic acid;    Nano-meter scale;    Nanofluids;    Sodium carboxymethyl cellulose;    Sodium salt;    Solid particles;    Thermal quadrupole methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/733/1/012015/pdf
DOI  :  10.1088/1742-6596/733/1/012015

来源: IOP

【 摘 要 】

Nanofluids are produced by dispersing nanometer-scale solid particles into base liquids such as water, ethylene glycol, etc. The thermal quadrupole method is utilized to determine the thermophysical properties of materials. By this technique, the thermal diffusivity and conductivity of different nanofluids containing the surfactants humic acid, sodium salt of humic acid and sodium carboxymethyl cellulose and multi-wall carbon nanotubes were evaluated at room temperature and at 75 °C. Values of thermal diffusivity varying in the range from 9.60x10-8m2s-1to 1.46x10-7m2s-1and thermal conductivity from 0.26 Wm-1K-1to 41 Wm-1K-1were obtained. As main conclusions, it was noted that nanofluids exhibit superior heat transfer characteristics than the conventional heat transfer fluid and the thermal conductivity is enhanced by 50% for the nanofluid containing 0.0275 mg/mL of sodium salt of humic acid + ethylene glycol, at the temperature of 25 °C.