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An experimental study on CHF enhancement in flow boiling using Al_2O_3 nano-fluid

机译：Al_2O_3纳米流体提高沸腾CHF的实验研究

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摘要

The critical heat flux (CHF) is one of the most important thermal hydraulic parameters in heat transfer system design and safety analyses. CHF enhancement allows higher limits of operation conditions such that heat transfer equipment can be operated safely with greater margins and better economy. The application of nano-fluids is thought to have strong potential for enhancing the CHF. In this study, zeta potentials of Al_O_3 nano-fluids were measured and flow boiling CHF enhancement experiments using Al_O_3 nano-fluids were conducted under atmospheric pressure. The CHFs of Al_O_3 nano-fluids were enhanced up to ～70% in flow boiling for all experimental conditions. Maximum CHF enhancement (70.24%) was shown at 0.01 vol% concentration, 50 ℃ inlet subcooling, and a mass flux of 100 kg/m~2 s. Inner surfaces of the test section tube were observed by FE-SEM and the zeta potentials of Al_O_3 nano-fluids were measured before and after the CHF experiments.
机译：临界热通量（CHF）是传热系统设计和安全性分析中最重要的热液压参数之一。 CHF的提高允许更高的运行条件限制，从而可以安全地以更大的余量和更好的经济性运行传热设备。认为纳米流体的应用具有增强CHF的强大潜力。在这项研究中，测量了Al_O_3纳米流体的zeta电位，并在大气压下使用Al_O_3纳米流体进行了沸腾CHF增强实验。在所有实验条件下，Al_O_3纳米流体的CHF在沸腾条件下均提高了约70％。在0.01vol％的浓度，50℃的入口过冷和100 kg / m〜2 s的质量通量下，最大CHF增强（70.24％）被显示。通过FE-SEM观察测试截面管的内表面，并在CHF实验之前和之后测量Al_O_3纳米流体的ζ电势。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第6期|1015-1022|共8页
  • 作者

    Tae II Kim; Yong Hoon Jeong; Soon Heung Chang;

  • 作者单位

    Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;

    Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;

    Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;

  • 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

    nano-fluid; CHF; flow boiling; deposition;

    机译：纳米流体CHF;流沸腾沉积;

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