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Journal of Nanostructures، جلد ۱۲، شماره ۳، صفحات ۶۴۲-۶۵۹
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عنوان انگلیسی Investigating Thermophysical Properties and Thermal Performance of Al2O3 Nanoparticles in Water and Ethylene Glycol Based Fluids
چکیده انگلیسی مقاله In this study, the thermo-physical properties and thermal performance of Al2O3 nanoparticles were experimentally investigated in water-based fluid and ethylene glycol, and nanoparticles were produced by PNC1k-C device by electric explosion method. In order to measure the thermal conductivity, diameter and viscosity of the obtained nano-fluids, hot wire method (KD2-Pro device), dynamic light scattering (DLS) and Ostwald viscometer ASTM D445-06 were used respectively. The temperature range of the experiments was between 20 degrees to 50 degrees. The results showed that adding 1% by weight of sodium dodecyl gasoline sulfonate (SDBS) to Al2O3 + H2O stabilizes this nano-fluid for 22 days. In this case, the zeta potential is 37.7 mv, which indicates good nano-fluid stability. The results showed that with increasing the volume fraction of nanoparticles in the base fluid, the thermal conductivity, density, steam pressure and slope of the heating curve increase and the surface tension decreases. With increasing temperature, thermal conductivity and specific heat of water increased and density, viscosity and specific heat of nano-fluid decreased with different volume fractions. Also, with increasing the diameter of nanoparticles, the thermal conductivity decreased and the surface tension of the nano-fluid increased. The stronger the thermal properties of the base fluid, the greater the effect on the thermal conductivity of the nano-fluid. The obtained practical thermal conductivity coefficient was compared with the values of the prediction models of this coefficient. Based on the regression obtained for the calculated experimental results (R = 0.99), this value is consistent with the Timofeeva model.
کلیدواژه‌های انگلیسی مقاله Al2O3, Nano-fluid, Nanoparticles, Thermal conductivity, Thermo-physical Properties
نویسندگان مقاله Bahman Rahmatinejad |
Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran

نشانی اینترنتی https://jns.kashanu.ac.ir/article_112782_c45790838be0e7b9947a0092bc1ba454.pdf
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