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POE 오일 나노유체의 열물성과 분산성 평가를 위한 실험적 연구
이규선(Lee K. S.),이근안(Lee K. A.),이종섭(Lee J. S.),이형욱(Lee H. Y.),박성준(Park S. J.),이영선(Lee Y. S.),김상훈(Kim S),장석필(Jang S. P.),김정배(Kim J) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
To apply the nanofluids into the general vapor compression cycle, basically have to know the thermal properties including thermal conductivity and dynamic viscosity. And needs to show the dispersion characteristics for various nanofluids and concentrations. So, firstly this study showed experimentally the thermal properties for various concentration (0.1%~0.7%, as mass balance) and temperature(20℃~40℃) on Al₂O₃, TiO₂ and CuO nanofluids using base fluid as POE oil that has used in the scroll compressor for various refrigeration system. From the results, the dynamic viscosity of nanofluids was considerably changed from the base POE oil. And, the dispersion characteristics of various nanofluids using the simple methods like as analyzing the RGB value or measuring the sinking height of nanofluids were showed experimentally. Through the results, the dispersion characteristics of Al₂O₃, nanofluid was better than those of TiO₂, and CuO nanofluids not considering the real refrigeration cycle running conditions.
이승현 ( S. H. Lee ),김현진 ( H. J. Kim ),최태종 ( T. J. Choi ),김수빈 ( S. B. Kim ),강예준 ( Y. J. Kang ),김동진 ( D. J. Kim ),장석필 ( S. P. Jang ) 한국분무공학회 2015 한국액체미립화학회지 Vol.20 No.1
In this study, we prepare the Ag nanofluids synthesized by the chemical reduction method and measure the extinction coef- ficient of those nanofluids at a wavelength of 632.8 nm. The Ag nanofluids are synthesized by the chemical reduction method using silver nitrate (AgNO3) and sodium borohydride (NaBH4) in water and ethylene glycol (EG). For stable disper- sion of Ag particles in the base liquids, polyvinyl pyrrolidone (PVP) is added as a surfactant. The extinction coefficient of manufactured Ag nanofluids is measured by an in-house developed measurement system at the wavelength of 632.8 nm. The results show that the extinction coefficient of water-based and EG-based Ag nanofluids is linearly increased with respect to the particle loadings. Moreover, it is shown that the extinction coefficient of EG-based Ag nanofludis is higher than that of water-based Ag nanofluids. Finally we compare the experimental results with both the Maxwell-Garnett model and Rayleigh scattering approximation model, and they demonstrate that the Rayleigh scattering approximation model is reasonably predict the extinction coefficient of Ag nanofluids using hydraulic diameter of silver nanoparticle.