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首页> 外文期刊>Heat Transfer Engineering >Experimental and Numerical Investigation of Inlet Temperature Effect on Convective Heat Transfer of γ-Al_2O_3/Water Nanofluid Flows in Microtubes
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Experimental and Numerical Investigation of Inlet Temperature Effect on Convective Heat Transfer of γ-Al_2O_3/Water Nanofluid Flows in Microtubes

机译：入口温度对微管中γ-Al_2O_3/水纳米流对流传热影响的实验和数值研究

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摘要

Nanofluids are the combination of a base fluid with nanoparticles with sizes of 1-100 nm. In order to increase the heat transfer performance, nanoparticles with higher thermal conductivity compared to that of base fluid are introduced into the base fluid. Main parameters affecting single-phase and two-phase heat transfer of nanofluids are shape, material type and average diameter of nanoparticles, mass fraction and stability of nanoparticles, surface roughness, and fluid inlet temperature. In this study, the effect of inlet temperature of deionized water/alumina (Al2O3) nanoparticle nanofluids was both experimentally and numerically investigated. Nanofluids with a mass fraction of 0.1% were tested inside a microtube having inner and outer diameters of 889 and 1,067 mu m, respectively, for hydrodynamically developed and thermally developing laminar flows at Reynolds numbers of 650, 1,000, and 1,300. According to the obtained numerical and experimental results, the inlet temperature effect was more pronounced for the thermally developing region. The performance enhancement with nanoparticles was obtained at rather higher Reynolds numbers and near the inlet of the microtube. There was a good agreement between the experimental and numerical results so that the numerical approach could be further implemented in future studies on nanofluid flows.
机译：纳米流体是基础流体与尺寸为1-100 nm的纳米颗粒的组合。为了提高热传递性能，将与基础流体相比具有更高导热率的纳米颗粒引入基础流体中。影响纳米流体单相和两相传热的主要参数是形状，纳米颗粒的材料类型和平均直径，纳米颗粒的质量分数和稳定性，表面粗糙度和流体入口温度。在这项研究中，去离子水/氧化铝（Al2O3）纳米颗粒纳米流体的入口温度的影响进行了实验和数值研究。质量分数为0.1％的纳米流体分别在内径和外径分别为889和1,067μm的微管中进行测试，以研究在650、1,000和1,300的雷诺数下进行流体动力学发展和热发展的层流。根据获得的数值和实验结果，入口温度对热显影区域的影响更为明显。在相当高的雷诺数下并且在微管的入口附近获得了纳米颗粒的性能增强。实验结果和数值结果之间有很好的一致性，因此数值方法可以在未来对纳米流体流动的研究中进一步实施。

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  • 来源
    《Heat Transfer Engineering》 |2019年第12期|738-752|共15页
  • 作者

    Karimzadehkhouei Mehrdad; Sadaghiani Abdolali Khalili; Motezakker Ahmad Reza; Akgonul Sarp; Ozbey Arzu; Sendur Kuersat; Menguc M. Pinar; Kosar Ali;

  • 作者单位

    Sabanci Univ, Fac Engn & Nat Sci, Mechatron Engn Program, TR-34956 Istanbul, Turkey;

    Sabanci Univ, Fac Engn & Nat Sci, Mechatron Engn Program, TR-34956 Istanbul, Turkey;

    Sabanci Univ, Fac Engn & Nat Sci, Mechatron Engn Program, TR-34956 Istanbul, Turkey;

    Sabanci Univ, Fac Engn & Nat Sci, Mechatron Engn Program, TR-34956 Istanbul, Turkey;

    Sabanci Univ, Fac Engn & Nat Sci, Mechatron Engn Program, TR-34956 Istanbul, Turkey;

    Sabanci Univ, Fac Engn & Nat Sci, Mechatron Engn Program, TR-34956 Istanbul, Turkey;

    Ozyegin Univ, Dept Mech Engn, Istanbul, Turkey;

    Sabanci Univ, Fac Engn & Nat Sci, Mechatron Engn Program, TR-34956 Istanbul, Turkey|Sabanci Univ, Ctr Excellence Funct Surfaces & Interfaces Nanodi, Istanbul, Turkey;

  • 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);
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