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首页> 外文期刊>International Journal of Heat and Mass Transfer >Optimum ratio of hydrophobic to hydrophilic areas of biphilic surfaces in thermal fluid systems involving boiling
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Optimum ratio of hydrophobic to hydrophilic areas of biphilic surfaces in thermal fluid systems involving boiling

机译：在涉及沸腾的热流体系统中，两亲性表面的疏水区与亲水区的最佳比例

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Pool boiling has a high heat removal capability and is considered as one of the most effective cooling methods due to utilization of latent heat of vaporization. Surface wettability plays a key role in boiling heat transfer since it controls the contact line between liquid, gas, and solid phases. Here, surfaces with mixed wettability (biphilic) were fabricated for assessing the effect of biphilic surfaces on bubble dynamics and boiling heat transfer as well as for the determination of an optimum hydrophobic area to the total surface area (A* = A(Hydrophobic)/A(total)) to achieve the best heat transfer performance. Pool boiling experiments were conducted on biphilic surfaces with A* ranging from 0.19% to 95%. It was shown that biphilic surfaces directly affected both the critical heat flux (CHF) and boiling heat transfer. According to the experimental results, the surface with A* of 38.46% delivered the highest CHF enhancement (197 W/cm(2), and maximum boiling heat transfer enhancement of 103%) among the tested biphilic surfaces. To represent a better understanding of related heat transfer mechanisms, bubble dynamics was obtained using a high-speed camera system. Visualization results revealed that bubble formation took place sooner on biphilic surfaces with A* of higher than 38.46%, thereby triggering the generation of vapor blanket on the surfaces and CHF occurrence at lower heat fluxes. (C) 2019 Elsevier Ltd. All rights reserved.
机译：池沸腾具有高的排热能力，并且由于利用了汽化潜热而被认为是最有效的冷却方法之一。表面润湿性在沸腾热传递中起关键作用，因为它控制着液相，气相和固相之间的接触线。在此，制造了具有混合润湿性（双亲性）的表面，用于评估双亲性表面对气泡动力学和沸腾传热的影响，以及确定相对于总表面积的最佳疏水面积（A * = A（疏水）/ A（总计））以实现最佳的传热性能。池沸腾实验在A *范围从0.19％到95％的双亲表面上进行。结果表明，双亲表面直接影响临界热通量（CHF）和沸腾传热。根据实验结果，在测试的双亲表面中，A *为38.46％的表面提供了最高的CHF增强（197 W / cm（2），最大沸腾传热增强为103％）。为了更好地理解相关的传热机理，使用高速摄像系统获得了气泡动力学。可视化结果表明，气泡形成在A *高于38.46％的双亲表面上较早发生，从而触发了表面上的蒸汽覆盖层的生成，并在较低的热通量下触发了CHF的发生。 （C）2019 Elsevier Ltd.保留所有权利。

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