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首页> 外文期刊>International Journal of Heat and Mass Transfer >Performance enhancement of graphene-coated micro heat pipes for light-emitting diode cooling
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Performance enhancement of graphene-coated micro heat pipes for light-emitting diode cooling

机译：用于发光二极管冷却的石墨烯涂层微热管的性能增强

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摘要

The rate of water transport through graphene nanocapillaries is profoundly enhanced compared to that in microscale capillaries due to the prevalence of exceptionally high capillary pressures and large slip lengths. As an inaugural study, we integrate graphene nanocapillaries into a micro heat pipe (MHP) for enhanced light-emitting diode (LED) cooling. With the use of graphene nanocapillaries, the ultrafast water transport synergically enhances the water circulation and evaporation process in the microfluidic device. The graphene-coated MHP achieves more than 45% enhancement in the overall performance compared to the uncoated counterpart. In turn, the experiments demonstrate a drastic reduction of LED's operating temperature (more than 25 °C) which translates into a significantly prolonged lifespan of LED. The molecular dynamics simulations reveal that the oxygenated functional groups attached on graphene further increase the capillary pressure (～1000 bar) and effective velocity (～20 m/s) of the nanoconfined water, compared to those (～500 bar and ～10 m/s) in a pristine graphene nanochannel. The ultrafast water transport in graphene nanocapillary is justified. This study provides a holistic analysis and important insight into the phenomenon of ultrafast water transport in graphene nanocapillaries that exhibits an enormous potential in thermal energy management applications for LED cooling.
机译：与毛细血管毛细血管中的微小毛细管压力和大滑动长度的普及率相比，通过石墨烯纳米植物的水分传输速率深受增强。作为一个真主的研究，我们将石墨烯纳米脂素集成到微热管（MHP）中，以增强发光二极管（LED）冷却。随着石墨烯纳米植物的使用，超快水运输协同增强了微流体装置中的水循环和蒸发过程。与未涂层的对应相比，石墨烯-涂层MHP在整体性能方面的增强超过45％。反过来，实验表明LED的工作温度（超过25°C以上）的急剧降低，这转化为LED的显着延长的寿命。分子动力学模拟表明，与那些（〜500巴和约10米/米/米）相比，附着在石墨烯上的含氧官能团进一步增加毛细管压力（〜1000巴）和有效速度（〜20m / s）和s）在原始石墨烯纳米通道中。石墨烯纳米植物中的超快水运输是合理的。本研究提供了整体分析和对石墨烯纳米植物中的超快水运输现象的重要见解，该纳米植物在LED冷却的热能管理应用中表现出巨大潜力。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第6期|119687.1-119687.13|共13页
  • 作者

    Jie Sheng Gan; Hao Yu; Ming Kwang Tan; Ai Kah Soh; Heng An Wu; Yew Mun Hung;

  • 作者单位

    School of Engineering Monash University 47500 Bandar Sunway Malaysia;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modem Mechanics CAS Center for Excellence In Complex SystemMechanics University of Science and Technology of China Hefei 230027 China;

    School of Engineering Monash University 47500 Bandar Sunway Malaysia;

    School of Engineering Monash University 47500 Bandar Sunway Malaysia;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modem Mechanics CAS Center for Excellence In Complex SystemMechanics University of Science and Technology of China Hefei 230027 China;

    School of Engineering Monash University 47500 Bandar Sunway Malaysia;

  • 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

    Graphene nanocapillaries; Ultrafast water transport; Micro heat pipe; Electronics cooling;

    机译：石墨烯纳米植物;超快水运输;微热管;电子冷却;

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