Effective thermal conductivities and viscosities of water-based nanofluids containing Al2O3 with low concentration

2007 7th IEEE Conference on Nanotechnology (IEEE NANO) Pub Date : 2007-08-01 DOI:10.1109/NANO.2007.4601354

S. Jang, K. Hwang, Ji-Hwan Lee, Jun Ho Kim, B. Lee, S.U.S. Choi

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引用次数: 17

Abstract

We experimentally investigated effective thermal conductivities and viscosities of water-based nanofluids containing Al₂O₃ (Al₂O₃-nanofluids) with low concentration from vol. 0.01% to 0.3%. Without surfactant, Al₂O₃-nanofluids are manufactured by two-step method which is widely used. To examine suspension and dispersion characteristics of Al₂O₃-nanofluids, zeta potential as well as transmission electron micrograph of Al₂O₃ nanoparticles is observed. The effective viscosities of Al₂O₃-nanofluids according to the temperature are measured by a viscometer of oscillating type. The transient hot wire method is used in this study to measure the effective thermal conductivities of Al₂O₃-nanofluids. Based on the results the maximum increase of effective viscosities of Al₂O₃-nanofluids is up to 2.9% while the maximum enhancement of effective thermal conductivities is up to 1.44%.

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含低浓度Al2O3的水基纳米流体的有效导热系数和粘度

实验研究了含Al2O3的水基纳米流体(Al2O3纳米流体)的有效导热系数和粘度，其浓度从0.01%到0.3%不等。在不添加表面活性剂的情况下，采用两步法制备了al2o3纳米流体。为了研究Al2O3纳米流体的悬浮和分散特性，观察了Al2O3纳米颗粒的zeta电位和透射电镜。用摆动式粘度计测定了氧化铝纳米流体的有效粘度随温度的变化。本文采用瞬态热丝法测量了al2o3纳米流体的有效导热系数。结果表明，al2o3纳米流体的有效粘度最大提高了2.9%，有效导热系数最大提高了1.44%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2007 7th IEEE Conference on Nanotechnology (IEEE NANO)

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