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首页> 外文期刊>Heat Transfer Engineering >Heat Transfer and Friction Factor With Water/Propylene Glycol-Based CuO Nanofluid in Circular Tube with Helical Inserts Under Transition Flow Regime
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Heat Transfer and Friction Factor With Water/Propylene Glycol-Based CuO Nanofluid in Circular Tube with Helical Inserts Under Transition Flow Regime

机译：过渡流动条件下水/基于丙二醇的CuO纳米流体在带螺旋插入物的圆管中的传热和摩擦系数

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摘要

The article deals with the transition flow convective heat transfer and friction factor characteristics of waterlpropylene glycol-based CuO nanofluids flowing in a horizontal circular tube fitted with and without helical inserts. CuO nanoparticles of average particle diameter less than 50 nm were suspended in the base fluid and nanofluids of three different concentrations were prepared. Experiments were also conducted by inserting helical inserts having twist ratio in the range of 0 to 9 and Reynolds number ranging from 2500 to 10,000. The Nusselt number obtained with 0.5% concentration of CuO nanofluids is about 28% higher in a plain tube and is increased further up to 5.4 times over the base fluid when the helical insert with twist ratio 3 is used. In the plane tube the friction factor is increased by 10% and further enhanced to 140% with the usage of helical insert compared to the friction factor obtained with the base fluid alone. The friction factor penalty is very much less compared to the benefit of heat transfer enhancement. Correlations for predicting Nusselt number and friction factor are developed using the experimental data pertaining to CuO nanofluids in a plain tube with and without the helical inserts.
机译：本文讨论了在装有和不装有螺旋插件的水平圆形管中流动的水丙二醇基CuO纳米流体的过渡流对流换热和摩擦因子特性。将平均粒径小于50 nm的CuO纳米颗粒悬浮在基础流体中，并制备了三种不同浓度的纳米流体。还通过插入螺旋比为0到9且雷诺数为2500到10,000的螺旋刀片来进行实验。在普通管中，浓度为0.5％的CuO纳米流体获得的Nusselt值高约28％，当使用扭曲比为3的螺旋插入物时，其努氏数是基础流体的5.4倍。与仅由基础流体获得的摩擦系数相比，在螺旋管中，使用螺旋形插件的摩擦系数增加了10％，并进一步提高到140％。与增强传热的好处相比，摩擦系数的损失要小得多。使用与有和没有螺旋形插入物的普通管中的CuO纳米流体有关的实验数据，开发了预测Nusselt数和摩擦系数的相关性。

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  • 来源
    《Heat Transfer Engineering》 |2014年第4期|53-62|共10页
  • 作者

    MALAVATH THAVARAYA NAIK; LINGALA SYAM SUNDAR;

  • 作者单位

    Centre for Energy Studies, College of Engineering, JNT University Hyderabad, Hyderabad, India;

    Nanotechnology Research Division, Department of Mechanical Engineering, University of Aveiro, Aveiro, Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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