Effect of Surface Biphilicity on FC-72 Flow Boiling in a Rectangular Minichannel
Effect of Surface Biphilicity on FC-72 Flow Boiling in a Rectangular Minichannel
复制标题
表面双亲性对FC-72矩形通道内流动沸腾的影响
DOI：
10.3389/fmech.2021.755580
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发表时间：
2021-10
期刊：
影响因子：
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通讯作者：
Akam Aboubakri;V. Ahmadi;Süleyman Çelik;A. Sadaghiani;K. Sefiane;A. Koşar
中科院分区：
文献类型：
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作者：
Akam Aboubakri;V. Ahmadi;Süleyman Çelik;A. Sadaghiani;K. Sefiane;A. Koşar
由于蒸发潜热的存在，流动沸腾是最有效的传热机制之一。表面改性，如混合润湿性有相当大的影响沸腾传热性能方面的强化沸腾传热以及临界热流密度。这项研究介绍了一种新的方法制造的bipilic表面，其中C4F8（八氟环丁烷）岛包围硅。制备了两种不同的双亲性表面，并与作为参考的完全均匀的疏水表面进行了比较。每个双亲表面具有三个不同的部分，即入口区域、中间区域和出口区域。第一区域主要是疏水性的（入口），而第三区域主要是亲水性的（出口）。得到了不同热流密度下的换热系数。结果表明，与完全均匀的疏水表面相比，双亲表面的沸腾传热性能提高了50%。可视化结果表明，在泡状流区，双性表面导致更多的成核点，而在弹状流区，双性表面使细长气泡破碎。
Flow boiling is one of the most effective mechanisms in heat transfer thanks to the latent heat of vaporization. Surface modifications such as mixed-wettability have a considerable effect on the boiling heat transfer performance in terms of enhancement in boiling heat transfer as well as critical heat flux. This study introduces a new method of fabrication of biphilic surfaces, where C4F8 (Octafluorocyclobutane) islands are surrounded by silicon. Two different biphilic surfaces were fabricated and compared with the entirely uniform hydrophobic surface taken as a reference,. Each of the biphilic surfaces has three different sections, namely inlet, middle and outlet regions. The first region is mainly hydrophobic (inlet), while the third region is mainly hydrophilic (outlet). The heat transfer coefficients were obtained at different heat fluxes. Compared to the entirely uniform hydrophobic surface, the results show that biphilic surfaces enhance the boiling heat transfer performance by up to 50%. The visualization results revealed that the biphilic surfaces lead to more nucleation sites in the bubbly flow regime and break up the elongated bubbles in the slug flow regime.