SiO_2-EG纳米流体的制备及热物性能 |
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引用本文: | 朱保杰,赵蔚琳,李金凯,管延祥,李东东.SiO_2-EG纳米流体的制备及热物性能[J].纳米科技,2011(2):52-57. |
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作者姓名: | 朱保杰 赵蔚琳 李金凯 管延祥 李东东 |
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作者单位: | 济南大学材料科学与工程学院; |
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基金项目: | 山东省自然科学基金项目(Y2007F28); 济南市高校院所自主创新计划项目(200906048) |
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摘 要: | 将平均粒径为30nm和50nm的SiO2纳米颗粒添加到EG(乙二醇)的基液中制成SiO2-EG纳米流体,利用粒度分析法、吸光度分析法和Zeta电位分析法分析其悬浮稳定性,当超声时间为3h时,其分散性和稳定性最好。对SiO2-EG纳米流体的热物性能参数如黏度、表面张力、导热系数,在不同体积分数、粒度和温度条件下进行测试分析表明,SiO2-EG纳米流体的黏度高于基液的黏度,表面张力低于基液的表面张力,导热系数高于基液的导热系数。在常温下,体积分数为0.5%时,30nm和50nm两种粒径的SiO2-EG纳米流体的粘度比EG粘度分别提高了15.41%和13.17%,表面张力系数比EG分别降低了3.23%和2.54%,导热系数分别提高38.36%和31.47%。进一步研究发现温度的升高导致SiO2-EG纳米流体的粘度和表面张力系数均有所降低,而导热系数却增加。
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关 键 词: | SiO2-EG纳米流体 粘度 表面张力 导热系数 |
Preparation and Thermal Properties of SiO_2-EG Nanofluids |
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Authors: | ZHU Bao-jie ZHAO Wei-lin LI Jin-kai GUAN Yan-xiang LI Dong-dong |
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Affiliation: | ZHU Bao-jie,ZHAO Wei-lin,LI Jin-kai,GUAN Yan-xiang,LI Dong-dong (School of materials science and engineering,University of Jinan,Jinan 250022,China) |
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Abstract: | SiO2 nanoparticles with average diameters of 30nm and 50nm were added into ethylene glycol to prepare SiO2-EG nnanofluids. The analysis of particle size, sorbancy, and zeta potential indicate that the uniformly and stably disperse SiO2 nanoparticles in Ethylene glycol can be obtained by 3 hours of ultrasonic vibration. The properties of SiO2-EG nanofluids such as viscosity, surface tension coefficient and thermal conductivity were investigated under the conditions of various concentrations, particle size an... |
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Keywords: | SiO2-EG nanofluids viscosity surface tension thermal conductivity |
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