EVALUATION OF STABILITY AND ENHANCEMENT OF NANO FLUID METHODS

Jan 10, 2024

Journal Journal of Physics: Conference Series

publisher IOP Publishing

DOI doi:10.1088/1742-6596/2688/1/012016

Issue 2688 (2024) 012016

Over the last ten years, there has been a substantial increase in research on nanofluids, and the findings indicate that these fluids are superior heat transfer fluids for application in engineering. The improved heat transfer is exclusively dependent on the thermal conductivity of the nanoparticles at constant particle volume concentrations and flow rates. By creating hybrid nanoparticles, one can change or vary the thermal conductivity of nanoparticles. Nanoscale particles with two or more separate components come together to form hybrid nanoparticles. Fluids made from hybrid nanoparticles are known as hybrid nanofluids. By utilizing more sophisticated materials, hybrid Nano fluids aim to significantly boost heat transmission. Results shows that the nanofluid stability is sensitive to environmental conditions including temperature, pH, and shear rate. It should be using surfactants, additives such as polymers and colloids, ultra-sonication, high shear mixing, applying magnetic field.

Heat pump performance enhancement by using a nanofluids (experimental study)

Apr 2, 2021

Journal journal of Mechanical Engineering Research and Developments

Issue vol. 44, No. 2, pp. 01-09

Nowadays, heat pumps are widely used for air conditioning, cooling, and heating. It is well known that nano particles can enhance conduction and convection coefficients, raising the transfer of heat and thus. Heat pump was filled with R600a during the experimental work, then copper oxide CuO and Aluminum oxide AL2O3 were used in different amounts and combined with pure water to obtain a nanoscale solution that we use for heat pump condenser cooling. Three proportions were used from CuO and AL2O3 (0.1%, 0.3%,0.5%) in the current study. The study results revealed that the efficiency coefficient increased by 22 %, but the energy consumption decreased by 31 % when using 0.5 % CUO instead of the traditional pure water used to cool the heat pump condenser. Finally, we infer from the results that as a result of the use of copper oxide with a ratio of 0.5 %, the cooling effect will be increased and the compressor work will be decreased.

Mixed convective of hybrid nanofluids flow in a backward-facing step

Jan 30, 2021

Journal Case Studies in Thermal Engineering

DOI doi.org/10.1016/j.csite.2021.100868

Issue 100868

Volume 25

Convective of hybrid nanofluids heat transfer flow over backward facing step in a heated rect angular duct under laminar flow is performed experimentally. It is used mixing of Al2O3 and TiO2 solid nanoparticles suspended in pure water. The preparation process of hybrid nanofluid for 1%, 2% and 3% mass fraction has been conducted. The test rig of this experimental study has been fabricated then both temperature and pressure drop along the duct have been measured. The duct is heated from the bottom by using an electrical heater and the other walls are being insulated. Results of heat transfer enhancement and pressure drop are indicated. It was observed that Nusselt number increases with increase of Reynolds number and mass fraction while, friction factor decreases as decrease of Reynolds number and increase of mass fraction. It is concluded that significant using the hybrid nanofluid through facing step. The enhancement of heat transfer and pressure drop are approximately 14% and 4% respectively.

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