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Abstract: The thermal conductivity, viscosity, and stability of nanofluids were evaluated to determine how varying experimental conditions can affect these properties. It was determined that increasing the concentration, temperature, and time spent sonicating the nanofluids can increase the thermal conductivity, while the addition of alcohol caused a decrease in thermal conductivity. Furthermore, it was found that the shape of the particles has an effect on the measured thermal conductivity. It was found that increasing the concentration increased the viscosity of the nanofluids as expected; however, increasing other parameters decreased the viscosity. The stability of the suspension of nanofluids is affected by concentration and sonication time. A higher concentration causes a shorter sedimentation time, while increasing the sonication time caused less particles to settle.

Reference: Master's Thesis, Royal Institute of Technology (2012)