Particle shape effect on the viscosity and thermal conductivity of ZnO nanofluids |
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| Authors: | Jisun Jeong Chengguo Li Younghwan Kwon Jaekeun Lee Soo Hyung Kim Rin Yun |
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| Affiliation: | 1. Defense Agency for Technology and Quality, 275-18, Boksu-dong, Seo-gu, Daejeon 302-210, Republic of Korea;2. School of Mechanical Engineering, Pusan National University, 30 Jangjeon-dong, Busan 609-735, Republic of Korea;3. Department of Nanomechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, 30 Jangjeon-dong, Busan 609-735, Republic of Korea;4. Department of Mechanical Engineering, Hanbat National University, Duckmyung-dong, San 16-1, Daejeon 305-719, Republic of Korea |
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| Abstract: | The viscosity and thermal conductivity of ZnO nanofluids with nanoparticle shapes of nearly rectangular and of sphere, were experimentally investigated under various volume concentrations of the nanoparticles, ranging from 0.05 to 5.0 vol.%. The viscosity of the nanofluids increased with increases in the volume concentration by up to 69%. In addition, the enhancement of the viscosity of the nearly rectangular shape nanoparticles was found to be greater by 7.7%, than that of the spherical nanoparticles. The thermal conductivity of the ZnO nanofluids increased by up to 12% and 18% at 5.0 vol.% for the spherical and the nearly rectangular shape nanoparticles, respectively, compared to that of the base fluid (water). The shape of the particles is found to have a significant effect on the viscosity and thermal conductivity enhancements. |
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| Keywords: | ZnO nanofluids Heat transfer Thermal conductivity Viscosity Shape effect Nanofrigorigènes ZnO Transfert de chaleur Conductivité thermique Viscosité Effet de forme |
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