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Manipulating the heat transfer of pool boiling by tuning the bubble dynamics with mixed wettability surfaces

机译：通过用混合润湿性表面调节气泡动力学来操纵池沸腾的传热

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摘要

Boiling heat transfer is widely involved in various energy conversion and utilization systems owing to its high heat transfer ecoefficiency even at low temperature differences. It is still a great challenge to control the boiling behaviors due to their multiple influencing factors and their randomness of bubble behaviors. The wettability greatly affects the boiling heat transfer. Hydrophobic surfaces can promote bubble nucleation and increase the heat transfer coefficient of nucleate boiling, while hydrophilic surfaces can promote bubble detachment, inhibiting film boiling, and hence increasing the critical heat flux. In order to meet such mixed requirements of wettability at different boiling stages, we propose a scalable and affordable method to fabricate the hydrophilic / hydrophobic mixed wettability surface. Compared with pure hydrophilic or superhydrophobic surfaces, the mixed surfaces exhibit higher heat transfer coefficient than the hydrophilic surface at low superheat degrees but larger critical heat flux than the hydrophobic surface at high superheat degrees. Therefore, the mixed wettability surfaces are more adaptable for a wider range of inputted heat flux. Such boiling heat transfer characteristics is the resultant of the unique bubble dynamics. The bubbles are likely to pinned on the hydrophobic spots but more easily detach from hydrophilic area. Tuning the hydrophilic / hydrophobic area ratio can manipulate the bubble dynamics. A numerical model is used to mimic the boiling on the hydrophilic / hydrophobic mixed surface, which agrees with the experimental results. And then the optimal area ratio is suggested by a boiling phase diagram based on a large number of simulations with various area ratios. Besides proposing a scalable and affordable way to fabricate the hydrophilic / hydrophobic mixed wettability surface, we also provide details of bubble dynamics on the pure or mixed wettability surfaces. Such details facilitate to understand the enhancement mechanisms of boiling heat transfer on mixed surface, which is still an open issue. The effects of the area ratios on the heat transfer coefficient are also discussed, which would provide a guideline to fabricate the mixed boiling enhancement surfaces.
机译：沸腾的热传递广泛参与各种能量转换和利用系统，甚至在低温差异的高温传递eCootFiby期间。控制沸腾行为仍然是一个巨大的挑战，因为它们的多种影响因素及其泡沫行为随机性。润湿性极大地影响了沸腾的传热。疏水表面可以促进泡沫成核并增加核心沸腾的传热系数，而亲水性表面可以促进泡沫脱离，抑制膜沸腾，从而增加临界热通量。为了满足不同沸腾阶段的润湿性的这种混合要求，我们提出了一种可扩展且价格合理的方法来制造亲水/疏水混合润湿性表面。与纯亲水或超疏水表面相比，混合表面比低过热度的热转移系数较高，但在高过热度下比疏水表面较大的临界热通量。因此，混合润湿性表面更适合于更广泛的输入热通量。这种沸腾的传热特性是独特的泡沫动力学的所合成。气泡可能钉在疏水斑点上，但更容易从亲水区域分离。调整亲水/疏水区域比可以操纵气泡动力学。使用数值模型用于模拟沸腾的亲水/疏水混合表面，这与实验结果一致。然后基于具有各种面积比的大量模拟的沸点图来提出最佳面积比。除了提出制备亲水/疏水混合润湿性表面的可扩展和实惠的方法外，还提供纯或混合润湿性表面上的气泡动力学的细节。这些细节有助于了解在混合表面上沸腾的增强机制，仍然是一个开放的问题。还讨论了面积比对传热系数的影响，这将提供制造混合沸腾增强表面的指导。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|120996.1-120996.12|共12页
  • 作者

    Yuanyuan Li; Yuting Li; Wei Jiao; Xueqing Chen; Gui Lu;

  • 作者单位

    State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;

    Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education North China Electric Power University Beijing 102206 China;

    Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education North China Electric Power University Beijing 102206 China;

    Office of Science and Technology Administration Guangdong Mechanical and Electrical College 510515 Guangzhou China;

    Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education North China Electric Power University Beijing 102206 China;

  • 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

    Hydrophilic/hydrophobic mixed wettability; surfaces; Pool boiling; Bubble dynamics; Heat transfer coefficient; Critical heat flux;

    机译：亲水/疏水混合润湿性;表面;池沸腾;泡沫动态;传热系数;临界热量;

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