히트파이프 작동유체 개발을 위한 에탄올-탄소나노튜브 나노유체의 열전도도 및 점도 특성 연구
Study on the Thermal Conductivity and Viscosity of Ethanol with Carbon Nanotubes for the Development of a Heat Pipe Working Fluid
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Nanofluids using Carbon Nanotubes have a excellent thermal characteristic. In this study, for increasing the efficiency of solar collector, the thermal conductivity and viscosity of Ethanol-Oxidized Multi-walled Carbon Nanofluids were measured. Nanofluids were manufactured by ultra-sonic dispersing Oxidized Multi-walled Carbon Nanotubes(OMWCNTs) in ethanol at the rates of 0.0005 ∼ 0.1 vol%. The thermal conductivity and viscosity of manufactured nanofluids were measured at the low temperature(10℃), the room temperature(25℃) and the high temperature(70℃). For measuring thermal conductivity and viscosity, we used transient hot-wire method and rotational digital viscometer, respectively. As a result, under given temperature conditions, thermal conductivity of the 0.1 vol% nanofuids improved 33.74% (10℃), 33.14% (25℃) and 32.36% (70℃), and its viscosity increased by 37.93% (10℃), 31.92% (25℃) and 29.42% (70℃) than the base fluids.
Abstract
Nanofluids using Carbon Nanotubes have a excellent thermal characteristic. In this study, for increasing the efficiency of solar collector, the thermal conductivity and viscosity of Ethanol-Oxidized Multi-walled Carbon Nanofluids were measured. Nanofluids were manufactured by ultra-sonic dispersing Oxidized Multi-walled Carbon Nanotubes(OMWCNTs) in ethanol at the rates of 0.0005 ∼ 0.1 vol%. The thermal conductivity and viscosity of manufactured nanofluids were measured at the low temperature(10℃), the room temperature(25℃) and the high temperature(70℃). For measuring thermal conductivity and viscosity, we used transient hot-wire method and rotational digital viscometer, respectively. As a result, under given temperature conditions, thermal conductivity of the 0.1 vol% nanofuids improved 33.74% (10℃), 33.14% (25℃) and 32.36% (70℃), and its viscosity increased by 37.93% (10℃), 31.92% (25℃) and 29.42% (70℃) than the base fluids.
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