물-에탄올 기반 이성분 산화탄소나노유체의 특성 비교 연구
A Comparative Study on the Characteristics of Binary Oxidized Carbon Nanofluids Based DI Water and Ethanol
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초록
A nanofluidisafluidcontainingsuspendedsolidparticles,withsizesontheorderofnanometers.Normally,nanofluids havehigherthermalconductivitiesthantheirbasefluids.Therefore,wemeasuredthethermalconductivityandviscosity ofoxidizedcarbonnanofluidsbasedthemixtureofdistilledwaterandethanol(ethanolconcentrationis0.2)oxidized carbonnanofluidsweremadebyultrasonicdispersingoxidizedmulti-walledcarbonnanotubesinthemixtureofdistilled waterandethanolattheratesof0.001∼ 0.1vol%.Thethermalconductivity and viscosity ofoxidized carbon nanofluidsweremeasuredbyusingtransienthot-wiremethodandrotationaldigitalviscometer,respectively.Andall ofexperimentswerecarriedoutatthesametemperatureconditions(10℃,25℃ and70℃).Asaresult,whenvolume fractionofnanofluidsis0.1vol%,thermalconductivitywasimproved13.6% (10℃),15.1% (25℃),and17.0% (70℃),anditsviscositywasincreasedby36.0% (10℃),32.9% (25℃)and19.5% (70℃)thanthebasefluids.
Abstract
A nanofluidisafluidcontainingsuspendedsolidparticles,withsizesontheorderofnanometers.Normally,nanofluids havehigherthermalconductivitiesthantheirbasefluids.Therefore,wemeasuredthethermalconductivityandviscosity ofoxidizedcarbonnanofluidsbasedthemixtureofdistilledwaterandethanol(ethanolconcentrationis0.2)oxidized carbonnanofluidsweremadebyultrasonicdispersingoxidizedmulti-walledcarbonnanotubesinthemixtureofdistilled waterandethanolattheratesof0.001∼ 0.1vol%.Thethermalconductivity and viscosity ofoxidized carbon nanofluidsweremeasuredbyusingtransienthot-wiremethodandrotationaldigitalviscometer,respectively.Andall ofexperimentswerecarriedoutatthesametemperatureconditions(10℃,25℃ and70℃).Asaresult,whenvolume fractionofnanofluidsis0.1vol%,thermalconductivitywasimproved13.6% (10℃),15.1% (25℃),and17.0% (70℃),anditsviscositywasincreasedby36.0% (10℃),32.9% (25℃)and19.5% (70℃)thanthebasefluids.
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