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首页> 外文期刊>Heat Transfer Engineering >Rheological Characteristics, Pressure Drop, and Skin Friction Coefficient of MWCNT-Oil Nanofluid Flow Inside an Inclined Microfin Tube
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Rheological Characteristics, Pressure Drop, and Skin Friction Coefficient of MWCNT-Oil Nanofluid Flow Inside an Inclined Microfin Tube

机译：倾斜微翅片管内MWCNT-油纳米流体的流变特性，压降和皮肤摩擦系数

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摘要

Rheological behavior, pressure drop, and skin friction coefficient of multiwalled carbon nanotubes (MWCNT)-oil nanofluid were investigated experimentally. Plain and microfin tubes were used as the test tubes under constant heat flux boundary conditions. Pure heat transfer oil and nanofluuids with particle weight concentrations of 0.05%, 0.1%, and 0.2% were utilized as the working fluuids. Shear stress, shear rate, and viscosity of base fluuid of all nanofluuids at different temperatures were measured and the effect of nanoparticle concentration on fluuid properties was investigated. Furthermore, effects of nanoparticles concentration, heat flux, natural convection, and inclination on pressure drop and skin friction coefficient were studied for Grashof number ranging from 103 to 104, Reynolds number ranging from 10 to 150, and particle weight concentrations up to 0.2%. Results showed that pressure drop and skin friction increased as inclination was increased from 0 to 90 degrees. Results also showed that the effect of addition of nanoparticles on pressure drop in a plain tube is more compared to the microfin one. At the end, a correlation was developed to calculate the skin friction coefficient in different inclinations and nanoparticle weight fractions.
机译：实验研究了多壁碳纳米管（MWCNT）-油纳米流体的流变行为，压降和皮肤摩擦系数。在恒定热通量边界条件下，将普通管和微翅片管用作测试管。使用纯热传递油和纳米流体，其浓度分别为0.05％，0.1％和0.2％，作为工作流体。测量了所有纳米流体在不同温度下的剪切应力，剪切速率和基础流体的粘度，并研究了纳米颗粒浓度对流体性质的影响。此外，研究了纳米粒子浓度，热通量，自然对流和倾斜度对压降和皮肤摩擦系数的影响，其中格拉斯霍夫数为103至104，雷诺数为10至150，颗粒浓度最高为0.2％。结果表明，压力下降和皮肤摩擦随着倾斜度从0度增加到90度而增加。结果还表明，与微翅片相比，添加纳米颗粒对平管中压降的影响更大。最后，建立了相关性以计算不同倾角和纳米颗粒重量分数下的皮肤摩擦系数。

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  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1436-1446|共11页
  • 作者

    MOHAMMAD M. DERAKHSHAN; MOHAMMAD A. AKHAVAN-BEHABADI; MOHAMMAD GHAZVINI;

  • 作者单位

    School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;

    School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;

    School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, Oregon, USA;

  • 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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