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首页> 外文期刊>Heat transfer >Thermohydraulic and entropy characteristics of Al_2O_3-water nanofluid in a ribbed interrupted microchannel heat exchanger
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Thermohydraulic and entropy characteristics of Al_2O_3-water nanofluid in a ribbed interrupted microchannel heat exchanger

机译：罗纹中断微通道热交换器中Al_2O_3水纳米流体的热液和熵特性

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摘要

In this study, an interrupted microchannel heat sink with rib turbulators was studied for its thermohydraulic effectiveness and entropy generation in a compact space. The rib edges are modified to enhance the overall functioning of the system by reducing the pressure drop. The working fluid used was Al_2O_3-water nanofluid, and increasing the Reynolds number and nano-particle concentration triggered a reduction in the heat sink's maximum temperature. These also offer a decrease in resistance to heat transfer, and there is an improvement in the evenness of the temperature of the interrupted microchannel heat sink, as regions with the likelihood of hot spot reduced drastically. At Re = 100, increasing the nanoparticle concentration from 0% to 4% enhanced the heat transfer coefficient by 38.41% for the interrupted microchannel heat sink-base (IMCH-B) configuration. Under similar conditions, the convective heat transfer coefficient for the interrupted micro-channel heat sink-fillet (IMCH-F) increased by 43.69%. Furthermore, at 0.5% concentration, changing the Reynolds number from 100 to 700 augmented the heat transfer coefficient by 70.65%. Thus, the maximum temperature of the substrate's bottom surface was reduced by 53.83°C when the system was operated at Re - 700 and nanoparticle concentration of 4%. The IMCH-C also showed relatively close results at all observed volume fractions. For the IMCH-C, the maximum temperature of the bottom surface was reduced by 41.98°C at Re = 700 when compared with Re = 100% and 4% concentration. Although at high Reynolds numbers and concentrations, the pressure drops are higher, the performance enhancement criteria prove that the nanofluid is superior to water and the edge modifications show significant performance improvement. More importantly, the IMCH-F heat sink showed the optimum performance based on the performance evaluation criteria at Re = 300 and Φ= 2% (ie, at this point, the heat transfer coefficient is maximum and the pressure drop is minimum). On the other hand, the optimal thermodynamic performance was observed at Re = 700 and Φ= 4%. The numerical results demonstrated a potential way to exploit nano-suspensions for thermal applications, especially for high-energy flux systems with compact space constraints.
机译：在该研究中，研究了具有肋湍流器的中断的微通道散热器，用于其在紧凑空间中的热液压效果和熵产生。修改肋条边缘以通过减小压降来增强系统的整体功能。所用的工作流体是Al_2O_3-水纳米流体，并增加雷诺数和纳米粒子浓度触发散热器的最高温度的降低。这些还会减少对传热的抵抗力，并且中断微通道散热器的温度的均匀性有所改善，因为热点可能性急剧减少的可能性。在RE = 100时，将纳米颗粒浓度从0％增加至4％，增强了中断的微通道散热器碱（IMCH-B）配置的38.41％的传热系数。在类似的条件下，中断微通道散热片 - 圆角（IMCH-F）的对流传热系数增加了43.69％。此外，在0.5％浓度下，将雷诺数从100％变为700，将传热系数增加70.65％。因此，当在RE-700和纳米颗粒浓度为4％时，将基板的底表面的最高温度降低53.83℃。 IMCH-C还显示出所有观察到的体积分数的相对接近的结果。对于IMCH-C，与RE = 100％和4％浓度相比，底表面的最大温度在RE = 700下减少41.98℃。尽管在高雷诺数和浓度下，压降较高，但性能提高标准证明纳米流体优于水，边缘修饰显示出显着的性能改善。更重要的是，IMCH-F散热器基于RE = 300的性能评估标准和φ= 2％（即，此时，传热系数最大并且压降最小）。另一方面，在RE = 700和φ= 4％的情况下观察到最佳热力学性能。数值结果证明了利用具有紧凑空间约束的高能通量系统的热应用纳米悬浮液的潜在方法。

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  • 来源
    《Heat transfer》 |2021年第3期|1951-1984|共34页
  • 作者

    Saheed A. Adio; Timothy A. Alo; Ridwan O. Olagoke; Adedotun E. Olalere; Vasudeva Rao Veeredhi; Daniel R. E. Ewim;

  • 作者单位

    Department of Mechanical and Industrial Engineering CSET University of South Africa Johannesburg South Africa Department of Mechanical Engineering Obafemi Awolowo University Ile-Ife Osun Nigeria;

    Department of Mechanical Engineering Obafemi Awolowo University Ile-Ife Osun Nigeria;

    Department of Mechanical Engineering Obafemi Awolowo University Ile-Ife Osun Nigeria;

    Department of Mechanical Engineering Obafemi Awolowo University Ile-Ife Osun Nigeria;

    Department of Mechanical and Industrial Engineering CSET University of South Africa Johannesburg South Africa;

    Department of Mechanical and Mechatronics Engineering Tshwane University of Technology Pretoria South Africa;

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

    entropy generation; heat transfer; interrupted microchannel heat sink; nanofluids; performance enhancement;

    机译：熵生成;传播热量;中断微通道散热器;纳米流体;性能增强;

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