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Surface Structure Enhanced MicroChannel Flow Boiling

机译:表面结构增强的微通道流动沸腾

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摘要

We investigated the role of surface microstructures in two-phase microchannels on suppressing flow instabilities and enhancing heat transfer. We designed and fabricated microchannels with well-defined silicon micropillar arrays on the bottom heated micro-channel wall to promote capillary flow for thin film evaporation while facilitating nuclea-tion only from the sidewalk. Our experimental results show significantly reduced temperature and pressure drop fluctuation especially at high heat fluxes. A critical heat flux (CHF) of 969 W/cm~2 was achieved with a structured surface, a 57% enhancement compared to a smooth surface. We explain the experimental trends for the CHF enhancement with a liquid wicking model. The results suggest that capillary flow can be maximized to enhance heat transfer via optimizing the microstructure geometry for the development of high performance two-phase microchannel heat sinks.
机译:我们研究了两相微通道中的表面微结构在抑制流动不稳定性和增强热传递方面的作用。我们设计并制造了在底部加热的微通道壁上具有定义明确的硅微柱阵列的微通道,以促进毛细流流动以蒸发薄膜,同时仅在人行道上促进核素迁移。我们的实验结果表明,尤其是在高热通量下,温度和压降波动明显减少。结构化表面的临界热通量(CHF)为969 W / cm〜2,与光滑表面相比提高了57%。我们用液体芯吸模型解释了CHF增强的实验趋势。结果表明,可以通过优化微观结构的几何形状来最大化毛细管流,以增强热传递,从而开发出高性能的两相微通道散热器。

著录项

  • 来源
    《Journal of Heat Transfer》 |2016年第9期|091501.1-091501.13|共13页
  • 作者单位

    Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139;

    Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139;

    Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139;

    Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139;

    NASA/Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109;

    Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology, Building 1A, P.O. Box 54224, Abu Dhabi, UAE;

    Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139;

  • 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

    microchannel flow boiling; surface microstructures; flow instabilities; critical heat flux;

    机译:微通道沸腾;表面微结构;流动不稳定性;临界热通量;

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