![]() ![]() Xie et al. pointed out that MgO nanofluids present higher thermal conductivity among ethylene glycol-based nanofluids containing oxide nanoparticles and low viscosity. It was also demonstrated that the addition of nanoparticles changes the electrical properties of ethylene glycol. ![]() In some cases, an increase in viscosity may also be associated with a change of liquid from Newtonian to non-Newtonian. However, when planning the practical use of nanofluids, it should be taken into account that with increasing concentration of the nanoparticles in a liquid its viscosity increases. The increase in thermal conductivity of nanofluids containing various types of nanoparticles was intensively studied. Nanofluids, suspensions of nanoparticles in a liquid base, are an interesting group of materials which, due to the increased thermal conductivity, are used in various industries, especially in energy sector and the automotive industry. Finally, evaluation of the heat transfer performance was presented. It was also shown that the enhancement of this basic physical properties might be described with good result with second degree polynomials. It was presented that the vast majority of theoretical models does not describe in a correct way both viscosity and thermal conductivity. Additionally, a comparison of the experimental results and the predictions of theoretical models was presented. To determine dynamic viscosity and thermal conductivity of samples, a HAAKE MARS 2 rheometer (Thermo Electron Corporation, Karlsruhe, Germany) and KD2 Pro Thermal Properties Analyzer (Decagon Devices Inc., Pullman, Washington, USA) were used. The aim of this paper is to provide experimental data on the dynamic viscosity and thermal conductivity of nanofluids containing MgO nanoparticles with 20 nm average size and ethylene glycol as base fluid. The literature informs that this material is characterized by an significant increase in thermal conductivity with low dynamic viscosity increase. One of the most promising materials in this group is magnesium oxide–ethylene glycol (MgO–EG) nanofluid. Nanofluids are a group of novel engineering materials that are increasingly being used, particularly in the processes of heat exchange. ![]()
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