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http://dx.doi.org/10.5855/ENERGY.2011.20.3.209

A Comparative Study on the Characteristics of Carbon Nanofluids for Efficiency Enhancement of Low Temperature Heat Exchanger  

Park, Sung-Seek (Department of Nuclear & Energy Engineering, Jeju National University)
An, Eoung-Jin (Department of Nuclear & Energy Engineering, Jeju National University)
Lee, Kyoung-Soo (Department of Nuclear & Energy Engineering, Jeju National University)
Park, Youn-Cheol (Department of Mechanical Engineering, Jeju National University)
Kim, Nam-Jin (Department of Mechanical Engineering, Jeju National University)
Publication Information
Journal of Energy Engineering / v.20, no.3, 2011 , pp. 209-215 More about this Journal
Abstract
In this study, for efficiency enhancement of low temperature heat exchanger, the thermal conductivity and the viscosity of carbon nanofluids and oxidized carbon nanofluids were measured at $10^{\circ}C$ and $25^{\circ}C$, respectively. Carbon nanofluids were made by ultrasonic-dispersing ones in distilled water after Multi-Walled Carbon Nanotubes (MWCNTs) mixed Sodium Dodecyl Sulfate (SDS, 100 wt%), Polyvinyl pyrrolidone (PVP, 300 wt%) each. Oxidized carbon nanofluids were made by ultrasonic-dispersing Oxidized Carbon Nanotubes (OMWCNTs) in distilled water. The thermal conductivity of carbon nanofluids was measured by using a transient hot-wire method. The viscosity was measured by using a digital viscometer. As a result, the thermal conductivity of oxidized carbon nanofluids was the highest of those compared and the other carbon nanofluids at the same mixture ratio and temperature, and the viscosity was measured the lowest of those compared and the other carbon nanofluids.
Keywords
Low temperature heat exchanger; Carbon nanotubes; Nanofluid; Thermal conductivity; Viscosity;
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