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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and theoretical studies of thermal conductivity, viscosity and heat transfer coefficient of titania and alumina nanofluids
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Experimental and theoretical studies of thermal conductivity, viscosity and heat transfer coefficient of titania and alumina nanofluids

机译：二氧化钛和氧化铝纳米流体的导热系数，粘度和传热系数的实验和理论研究

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摘要

Thermal conductivity, viscosity and heat transfer coefficient of water-based alumina and titania nanofluids have been investigated. The thermal conductivity of alumina nanofluids follow the prediction of Maxwell model, whilst that of titania nanofluids is slightly lower than model prediction because of high concentration of stabilisers. None of investigated nanofluids show anomalously high thermal conductivity enhancement frequently reported in literature. The viscosity of alumina and titania nanofluids was higher than the prediction of Einstein-Batchelor model due to aggregation. Heat transfer coefficients measured in nanofluids flowing through the straight pipes are in a very good agreement with heat transfer coefficients predicted from classical correlation developed for simple fluids. Experimental heat transfer coefficients in both nanofluids as well as corresponding wall temperatures agree within ±10% with the values obtained from numerical simulations employing homogeneous flow model with effective thermo-physical properties of nanofluids. These results clearly shows that titania and alumina nano-fluids do not show unusual enhancement of thermal conductivity nor heat transfer coefficients in pipe flow frequently reported in literature.
机译：研究了水基氧化铝和二氧化钛纳米流体的热导率，粘度和传热系数。氧化铝纳米流体的热导率遵循麦克斯韦模型的预测，而二氧化钛纳米流体的热导率由于稳定剂的高浓度而略低于模型预测。没有研究的纳米流体显示出异常高的导热率增强，这在文献中经常报道。由于聚集，氧化铝和二氧化钛纳米流体的粘度高于Einstein-Batchelor模型的预测。在流经直管的纳米流体中测得的传热系数与根据为简单流体开发的经典相关性预测的传热系数非常吻合。纳米流体中的实验传热系数以及相应的壁温与采用均相流动模型且具有有效的纳米流体热物理特性的数值模拟所获得的值相差在±10％之内。这些结果清楚地表明，二氧化钛和氧化铝纳米流体并未显示出文献中经常报道的管道流动中导热系数的异常提高或传热系数的变化。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第26期|p.7772-7781|共10页
  • 作者

    Adi T. Utomo; Heiko Poth; Phillip T. Robbins; Andrzej W. Pacek;

  • 作者单位

    School of Chemical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;

    Itn Nanovation AG, Untertuerkheimer Strasse 25, Saarbruecken 66117, Germany;

    School of Chemical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;

    School of Chemical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nanofluids; heat transfer; natural convection; CFD;

    机译：纳米流体传播热量;自然对流;差价合约;

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