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首页> 外文期刊>Heat Transfer Engineering >Nucleate Pool Boiling Heat Transfer on a Micro-Pin-Finned Surface in Short-Term Microgravity
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Nucleate Pool Boiling Heat Transfer on a Micro-Pin-Finned Surface in Short-Term Microgravity

机译：短期微重力下微针状表面上的核池沸腾传热

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摘要

Nucleate boiling heat transfer of air-dissolved FC-72 on a micro-pin-finned surface was experimentally investigated in microgravity by utilizing the drop tower facility in Beijing. The dimensions of the silicon chips were 10 mm × 10 mm × 05 mm and on these, two kinds of micro-pin-fins with the dimensions of 30 × 30 × 60 μm3 and 50 × 50 × 120 μm~3 (width × thickness x height, named PF30-60 and PF50-120) were fabricated by the dry etching technique. Nucleate pool boiling on a smooth surface was also studied under both Earth gravity and microgravity for comparison. In general, the micro-pin-fins showed better heat transfer performance when compared with a smooth surface, both under Earth gravity and microgravity. In microgravity, this is mainly due to the fact that bubbles generated on micro-pin-finned surface can depart from the heater surface continuously. For micro-pin-fins, the reduced-gravity critical heat flux was about two-thirds of that in the Earth gravity experiment, but almost three times as large as that for the smooth surface, which is larger than that in the terrestrial experiment. Under different gravity levels, PF50-120 shows a little better heat transfer than that of PF30-60, mainly due to larger heat transfer area. Besides, the fin gap of PF30-60 may generate a larger flow resistance for microconvection around the fin side walls, resulting in a lower heat transfer performance.
机译：利用北京的滴水塔装置，通过微重力实验研究了微针状翅片表面上溶解于空气的FC-72的核沸腾传热。硅芯片的尺寸为10 mm×10 mm×05 mm，在其上有两种尺寸为30×30×60μm3和50×50×120μm〜3（宽度×厚度）的微针鳍。通过干法刻蚀技术制造了高度为x的高度，称为PF30-60和PF50-120）。还比较了在地球重力和微重力作用下在光滑表面上沸腾的核池，以进行比较。通常，与大地重力和微重力作用下的光滑表面相比，微针状鳍片均具有更好的传热性能。在微重力下，这主要是由于以下事实：在微针翅片表面上产生的气泡可能会连续离开加热器表面。对于微针状鳍片，降低重力的临界热通量大约是地球重力实验的三分之二，但几乎是光滑表面的三倍，比陆地实验的大。在不同的重力水平下，PF50-120的传热效果比PF30-60略好，这主要是因为传热面积更大。此外，PF30-60的翅片间隙可能会为翅片侧壁周围的微对流产生较大的流阻，从而导致较低的传热性能。

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  • 来源
    《Heat Transfer Engineering》 |2017年第8期|594-610|共17页
  • 作者

    Yonghai Zhang; Jianfu Zhao; Jinjia Wei; Yanfang Xue;

  • 作者单位

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    Key Laboratory of Microgravity (National Microgravity Laboratory)/CAS, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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