铝合金分散乙二醇基纳米流体的热导率和流变行为

Journal of Astm International Pub Date : 2012-05-01 DOI:10.1520/JAI104435

G. Paul, J. Philip, B. Raj, P. Das, I. Manna

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引用次数: 1

摘要

铝合金(Al-5 wt. Zn和Al-5 wt. Si)纳米颗粒分散(0.01-2.00 vol.)乙二醇基纳米流体采用两步法制备。将机械合金化法制备的铝合金纳米颗粒通过x射线衍射(XRD)、透射电镜(TEM)、选择性区域衍射(SAD)和能谱仪(EDS)进行表征，分析粉末的性质、大小、形状和纯度。在0.1体积纳米颗粒浓度下，分散的纳米流体的导热系数最大增强为Al-5 wt. Zn和Al-5 wt. Si，分别为16和13。纳米流体的流变学研究显示出有趣的发现，因为观察到两种类型的纳米流体的粘度值在较低浓度时低于基础流体，而在较高浓度时则高于基础流体。在2.0的体积浓度下，分散的纳米流体的粘度最大增强可达180,Al-5 wt. Si和120。ASTM International版权所有Â©2012。

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Thermal conductivity and rheological behaviour of Al-alloy dispersed ethylene glycol based nanofluids

Al-alloy (Al-5 wt. Zn and Al-5 wt. Si) nanoparticle dispersed (0.01-2.00 vol. ) ethylene glycol based nanofluids are prepared by a two-step process. Prior to dispersing in ethylene glycol by magnetic stirring and ultrasonication the Al-alloy nanoparticles synthesized by mechanical alloying are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area diffraction (SAD), and energy dispersive spectroscopy (EDS) to analyze the identity, size, shape, and purity of the powder. A maximum thermal conductivity enhancement of 16 for Al-5 wt. Zn and 13 for Al-5 wt. Si dispersed nanofluids are observed at 0.1 vol. of nanoparticle concentrations. Rheological studies of nanofluids show interesting findings as the viscosity of both types of nanofluids are observed to exhibit values lower than that of base fluid at lower concentrations and higher at higher concentrations. Maximum enhancement of viscosity up to 180 for Al-5 wt. Si and 120 for Al-5 wt. Zn dispersed nanofluids are observed at 2.0 vol. concentration. Copyright Â© 2012 by ASTM International.

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Journal of Astm International

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