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Molecular dynamics study of convective heat transfer mechanism in a nano heat exchanger

机译：纳米热交换器中对流传热机理的分子动力学研究

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摘要

With the rapid development of micro/nano electro-mechanical systems, the convective heat transfer at the micro/nanoscale has been widely studied for the thermal management of micro/nano devices. Here we investigate the convective heat transfer mechanism of a nano heat exchanger by the employment of molecular dynamics simulation with a modified thermal pump method. First, the temperature jump and velocity slip are observed at the wall-fluid interfaces of the nano heat exchanger. Moreover, the larger Kapitza resistance in the entrance region weakens the convective heat transfer. Second, the heat transfer performance of the nano heat exchanger can be improved by increasing the surface wettability of the solid walls owing to more fluid atoms being involved in heat transport at the walls when the wall-fluid interaction is enhanced. Meanwhile, the strong surface wettability results in the appearance of the quasi-solid fluid layers, which improves the heat transfer between walls and fluids. Finally, we point out that when the surface wettability of the nano heat exchanger is weak, the heat transfer of the hot fluid side is better than that of the cold fluid side, while the convective heat transfer performances of the cold and hot fluid sides are reversed when the surface wettability is strong. This is because of the feebler temperature jump of the hot fluid side when wall-fluid interaction is small and the greater velocity slip of the cold fluid side for walls with large wall-fluid interaction.
机译：与微/纳机电系统的快速发展，在微观尺度/纳米尺度的对流热传递已被广泛研究用于微/纳米器件的热管理。在这里，我们通过调查就业分子动力学模拟与改进的热泵方法的纳米热交换器的对流换热机制。首先，温度跳跃和速度滑移在纳米热交换器的壁流体界面观察。此外，在入口区中的较大的电阻卡皮查削弱了的对流热传递。第二，纳米热交换器的传热性能可以通过增加由于被卷入在壁热输送多个流体原子时的壁流体相互作用被增强的固体壁的表面润湿性得到改善。同时，强表面润湿性的结果在准固体流体层的外观，这改善了壁和流体之间的热传递。最后，我们指出，当纳米换热器的表面润湿性较弱，热流体侧的传热比，冷流体侧，而冷的对流换热性能和热流体边逆转时表面润湿性强。这是因为热流体侧的瘦弱温度跳跃时壁流体相互作用较小，并且冷流体侧的用于与大壁流体相互作用壁更大的速度滑动。

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  • 来源
    《RSC Advances》 |2020年第39期|共11页
  • 作者

    Sun Haiyi; Li Fei; Wang Man; Xin Gongming; Wang Xinyu;

  • 作者单位

    Shandong Univ Inst Thermal Sci &

    Technol Jinan 250061 Peoples R China;

    Shandong Univ Inst Thermal Sci &

    Technol Jinan 250061 Peoples R China;

    Shandong Univ Inst Thermal Sci &

    Technol Jinan 250061 Peoples R China;

    Shandong Univ Sch Energy &

    Power Engn Jinan 250061 Peoples R China;

    Shandong Univ Inst Thermal Sci &

    Technol Jinan 250061 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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