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首页> 外文期刊>International Journal of Heat and Mass Transfer >Spatially-selective cooling by liquid jet impinging orthogonally on a wettability-patterned surface
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Spatially-selective cooling by liquid jet impinging orthogonally on a wettability-patterned surface

机译：通过垂直喷射在润湿性图案表面上的液体射流进行空间选择性冷却

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摘要

Jet impingement finds application in high-rate cooling because of its numerous merits, which, however, do not include selective directionality. The present study introduces a new configuration employing a wettability-patterning approach to divert an orthogonally-impinging laminar water jet onto a predetermined portion of the target surface. Diverging wettable tracks on a superhydrophobic background provide the means to re-direct the impinging jet and enable spatially-selective cooling on the heated surface. An open-surface heat exchanger is constructed using this approach, and its heat transfer performance is characterized. Sensible heat transfer is quantified in terms of the extracted cooling flux and the heat transfer coefficient. Since this approach facilitates prolonged liquid contact with the underlying heated surface through thin-film spreading, evaporative cooling is also promoted. Thus, phase-change heat transfer is also facilitated, and results in the extraction of 12.4W/cm~2 at water flow rate of ～1.5 mL/min. By comparing with other jet-impingement cooling approaches, the present method provides roughly four times more efficient cooling by using less amount of coolant. The reduced coolant use, combined with the gravity-independent character of this technique, offer a new paradigm for compact heat transfer devices designed to operate in reduced- or zero-gravity environments. Multiple hot spot cooling is also demonstrated using a single jet to feed two different tracks by minimally displacing or splitting the impinging jet.
机译：射流冲击因其众多优点而在高速冷却中得到了应用，但是它不包括选择性方向性。本研究介绍了一种新的配置，该配置采用可湿性图案化方法将正交撞击的层流水射流转移到目标表面的预定部分上。在超疏水背景下分散可湿性迹线提供了重新定向撞击射流并实现对加热表面进行空间选择性冷却的方法。使用这种方法构造了一个开放式热交换器，并对其传热性能进行了表征。根据提取的冷却通量和传热系数来量化显热传递。由于这种方法通过薄膜扩散促进了液体与下面的受热表面的长时间接触，因此还促进了蒸发冷却。因此，相变传热也很容易，在水流量约为1.5 mL / min时提取率达到12.4W / cm〜2。通过与其他喷射冲击冷却方法进行比较，本方法通过使用较少量的冷却剂而提供了大约四倍的有效冷却。减少的冷却剂用量，再加上该技术的与重力无关的特性，为设计用于在低重力或零重力环境下运行的紧凑型传热设备提供了新的范例。还演示了使用单个喷嘴通过最小程度地移动或分裂撞击的喷嘴为两条不同的轨迹供料的多种热点冷却方法。

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    Theodore P. Koukoravas; Aritra Ghosh; Pallab Sinha Mahapatra; Ranjan Ganguly; Constantine M. Megaridis;

  • 作者单位

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, United States;

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, United States;

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, United States;

    Department of Power Engineering, Jadavpur University, Kolkata 700098, India;

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, United States;

  • 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
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