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나노입자의 농도에 따른 나노유체의 동점도 특성에 관한 연구
박형수(Hyeong-Soo Park),황유진(Yu-Jin Hwang),이재근(Jae-Keun Lee),안영철(Young-Chull Ahn) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The kinematic viscosity of nanoparticles such as C60 (fullerene), CuO and multi-walled carbon nanotubes (MWCNT) dispersed in water and oil are measured using a capillary viscometer. The volume fraction of nanoparticles ranges from 0.001 to 1 vol.% and the fluid temperature ranges from 30 to 80 ℃. The experimental results of fullerene nanofluids have good agreement with the theoretical results based on Einstein-Brinkman's equation. But MWCNT nanofluids have sharp increasement of viscosity at 0.01 volume fraction. In case of CuO nanofluids dispersed in oil, the results quite agree with Einstein-Brinkman's equation.
황유진(Yu-jin Hwang),박형수(Hyeong-soo Park),이재근(Jae-Keun Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
It have been reported that thermal conductivity of nanofluids which consist of nanoparticles dispersed in basefluid is higher than that of basefluid. But the agglomerated particles cause severe problem in suspension stability and reproducibility. In this study, water, ethylene glycol and mineral oil are used as basefluid. CuO, SiO₂, C?? and multiwalled carbon nanotubes (MWCNTs) are used as the suspended nanoparticles. Stability of nanofluids has been estimated with an UV-vis spectrophotometer. A transient hot-wire system is used to measure the thermal conductivity of nanofluids. Thermal conductivity enhancement of nanofluids is affected by the theraml conductivity of basefluid and the types of suspended particles. Especially thermal conductivity of C??-in-water nanofluids decreases with increasing particle volume fraction.