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Thermal conductivity of Al2O3/water nanofluids |
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| Authors: | Mohammad Hemmat Esfe Seyfolah Saedodin Omid Mahian Somchai Wongwises |
| Affiliation: | 1. Faculty of Mechanical Engineering, Semnan University, Semnan, Iran 2. Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran 3. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok, 10140, Thailand |
| Abstract: | A considerable number of studies can be found on the thermal conductivity of nanofluids in which Al2O3 nanoparticles are used as additives. In the present study, the aim is to measure the thermal conductivity of very narrow Al2O3 nanoparticles with the size of 5 nm suspended in water. The thermal conductivity of nanofluids with concentrations up to 5 % is measured in a temperature range between 26 and 55 °C. Using the experimental data, a correlation is presented as a function of the temperature and volume fraction of nanoparticles. Finally, a sensitivity analysis is performed to assess the sensitivity of thermal conductivity of nanofluids to increase the particle loading at different temperatures. The sensitivity analysis reveals that at a given concentration, the sensitivity of thermal conductivity to particle loading increases when the temperature increases. |
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