CuO-ZnO混合纳米流体导热系数影响分析
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摘要
采用"两步法"制备了质量分数分别为1.0%,2.0%,3.0%,5.0%的CuO-ZnO混合纳米流体,制备过程中不添加分散剂。混合纳米流体选用乙二醇与去离子水作为基液,二者质量比(φv=EG:DW)分别为20:80,40:60,50:50,60:40和80:20,CuO与ZnO的质量比为温度范围从25℃到60℃,研究了不同比例基液、温度和质量分数对纳米流体导热系数的影响。结果表明:导热系数随混合纳米流体质量分数和温度的升高而增大。在温度为60℃时,质量分数为5.0%,基液比例φv为20:80的混合纳米流体导热系数增幅最大为26.1%。混合纳米流体的导热系数随乙二醇比例的增加而降低。实验还发现混合纳米流体导热系数与基液比例呈线性关系。
A two-step method is used to prepare CuO-ZnO hybrid nanofluids with 1.0%,2.0%,3.0% and 5.0% without any surfactant. The CuO-ZnO nanoparticles suspended in base fluid of ethylene glycol(EG) and water(W) mixture with 50:50(by weight) are investigated. The experiments are conducted for CuO-ZnO hybrid Nano fluids with different mixture ratio of 20:80,40:60,50:50,60:40 and 80:20.The measurements of thermal conductivity are performed in the temperature range of 25～60°C. This paper focuses on the effect of different ratio of base fluid,temperature and mass fraction on the thermal conductivity of hybrid nanofluids. The results reveal that the thermal conductivity increases with the increase of the mass fraction of the hybrid nanofluids and the temperature. The thermal conductivity of the hybrid nanofluid with mass fraction of 5.0% and a ratio of 20:80 increases by 26.1%.at the temperature of 60 °C. The thermal conductivity of hybrid nanofluids decreases as the proportion of the base fluid increases. The thermal conductivity of the hybrid nanofluids is linear with the ratio of the base fluid.
A two-step method is used to prepare CuO-ZnO hybrid nanofluids with 1.0%,2.0%,3.0% and 5.0% without any surfactant. The CuO-ZnO nanoparticles suspended in base fluid of ethylene glycol(EG) and water(W) mixture with 50:50(by weight) are investigated. The experiments are conducted for CuO-ZnO hybrid Nano fluids with different mixture ratio of 20:80,40:60,50:50,60:40 and 80:20.The measurements of thermal conductivity are performed in the temperature range of 25～60°C. This paper focuses on the effect of different ratio of base fluid,temperature and mass fraction on the thermal conductivity of hybrid nanofluids. The results reveal that the thermal conductivity increases with the increase of the mass fraction of the hybrid nanofluids and the temperature. The thermal conductivity of the hybrid nanofluid with mass fraction of 5.0% and a ratio of 20:80 increases by 26.1%.at the temperature of 60 °C. The thermal conductivity of hybrid nanofluids decreases as the proportion of the base fluid increases. The thermal conductivity of the hybrid nanofluids is linear with the ratio of the base fluid.
引文
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[2]S C PATIL,S K SAHU.Thermal Performanceof Automobile Radiator Using Carbon Nanotube-water Nanofluid-Experimental Study[J].Thermal Science Engineering Application,2014(6):106-109.
[3]陈秀娟,刘振华,开放式热管中温太阳能空气集热装置的试验研究[J].热科学与技术,2012,11(3):272-276.
[4]S U S CHOI.Nanofluids:from Vision to Reality Through Research[J].Journal of heat Transfer,2009(131):106-115.
[5]钟桂健,李龙,翟玉玲,等.纳米流体导热系数的影响因素分析[J].工业加热,2018,47(4):20-24.
[6]马林,陶冲,王昭利,等.纳米流体强化传热领域的研究进展及存在的问题[J].工业加热,2015,44(7):193-196.
[7]T T BABY,S RAMAPRABHU.Investigation of Thermal and Electrical Conductivity of Graphene Based Nanofluids[J].Journal of Physics,2010(108):124-126.
[8]S MURSHED,K C LEONG,C YANG,Investigations of Thermal Conductivity and Viscosity of Nanofluids[J].International Journal of Thermal Sciences,2008(47):560-568.
[9]S LEE,S U S CHOI,S LI,et al.Measuring Thermal Conductivity of Fluids Containing Oxide Nanoparticles[J].Journal of Heat Transfer,1999(121):280-289.
[10]C PANG,J Y JUNG,J W LEE,et al.Thermal Conductivity Measurement of Methanol-based Nanofluids with Al2O3 and SiO2Nanoparticles[J].International Journal of Heat and Mass Transfer,2012(55):5597-5602.
[11]S AKILU,K V SHARMA,A T BAHETA,et al.A Review of Thermophysical Properties of Water Based Composite Nanofluids[J].Renewable and Sustainable Energy Reviews,2016(66):654-678.
[12]R S VAJJHA,D K DAS.Experimental Determination of Thermal Conductivity of Three Nanofluids and Development of New Correlations[J].International Journal of Heat and Mass Transfer,2009(52):4675-4682.
[13]L SYAM SUNDAR,MANOJ K SINGH,ANTONIO C MSOUSA.Thermal Conductivity of Ethylene Glycol and Water Mixture Based Fe3O4 Nanofluid[J].International Journal of Heat and Mass Transfer,2013(49):17-24.