Stability and sedimentation characteristics of water based Al2O3 and TiO2 nanofluids

IF 4.2 Q2 NANOSCIENCE & NANOTECHNOLOGY
S. Mukherjee, Shanta Chakrabarty, P. Mishra, P. Chaudhuri
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引用次数: 1

Abstract

Nanofluids are regarded as promising heat transfer fluid due to their ultrafast cooling capability. However, stability analysis of nanofluids is very critical before its application in heat transfer .The present paper reports about an investigation on the stability of water-based Al2O3 and TiO2 nanofluids at ambient temperature. Nanoparticles, namely Al2O3 and TiO2 at different concentrations of 1, 0.5, 0.1, 0.05, and 0.01 wt.% respectively were directly dispersed in water without adding any dispersant and placed in a static container to observe gravitation settling. Change of sedimentation height with respect to time was measured using the sedimentation photograph capturing method. DLS (Dynamic Light Scattering) and zeta potential analysis were also executed to examine the stability of nanofluids. The results show that the visualization method, DLS and zeta potential analysis are in good correspondence to each other. Sedimentation velocity increases with an increase in nanoparticle concentration and aging. Brownian motion of nanoparticles resist the sedimentation in nanofluids. It is observed that TiO2nanofluid is more stable as compared to Al2O3 nanofluid due to its smaller particle size. Finally authors recommend smaller particle size, optimized sonication time, low nanoparticle concentration and use of surfactant to obtain better dispersion stability of nanofluids
水基Al2O3和TiO2纳米流体的稳定性和沉降特性
纳米流体因其超快的冷却性能而被认为是一种很有前途的传热流体。本文报道了水基Al2O3和TiO2纳米流体在室温下的稳定性研究。纳米颗粒,即Al2O3和TiO2,浓度分别为1、0.5、0.1、0.05和0.01 wt。%直接分散在水中,不添加任何分散剂,置于静态容器中,观察重力沉降。采用沉降摄影法测量了沉降高度随时间的变化。采用动态光散射(DLS)和zeta电位分析来考察纳米流体的稳定性。结果表明,可视化方法、DLS和zeta电位分析具有较好的一致性。沉降速度随纳米颗粒浓度的增加和老化而增加。纳米颗粒的布朗运动抑制了纳米流体中的沉降。观察到tio2纳米流体比Al2O3纳米流体更稳定,因为它的粒径更小。最后,作者建议减小粒径、优化超声时间、降低纳米颗粒浓度和使用表面活性剂来获得较好的纳米流体分散稳定性
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来源期刊
CiteScore
6.00
自引率
1.70%
发文量
24
期刊介绍: Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems is a peer-reviewed scientific journal published since 2004 by SAGE Publications on behalf of the Institution of Mechanical Engineers. The journal focuses on research in the field of nanoengineering, nanoscience and nanotechnology and aims to publish high quality academic papers in this field. In addition, the journal is indexed in several reputable academic databases and abstracting services, including Scopus, Compendex, and CSA's Advanced Polymers Abstracts, Composites Industry Abstracts, and Earthquake Engineering Abstracts.
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