Abstract
In this study, an experimental analysis was used to measure the thermal conductivity (knf) of WO3-MWCNTs/Engine Oil hybrid nanofluids, and a new significance was established. The preparation of nanofluid with a two-step method was achieved through the suspension of WO3 nanoparticles and MWCNTs in engine oil using ultrasonic waves. The diameter of the WO3 nanoparticles is in the range of 23 to 65 nm and the diameter of the MWCNTs in the range of 20 to 30 nm. According to the results, the knf grows as the temperature and volume fraction of nanoparticles (φ) go up. Of course, the φ has a more significant influence on the knf, compared to temperature. Also, the maximum amount of knf of hybrid nanofluid was at T = 60 °C and ϕ = 0.6%, which increased by 19.85% compared to the base fluid. At last, two mathematical models for assessing knf were introduced.
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