Abstract We conduct an experimental investigation on the pool boiling enhancement in DI water on nanoporous surfaces. The surfaces are modified by anodic oxidation, and cavities with 2 mm diameter and pitches between 2.5 and 5 mm applied on them using EDM method filled with a two-part epoxy with low thermal conductivity properties. The capillary wicking action of the superhydrophilic nanoporous oxide layer enhances the rewetting and spreading of the liquid to dry-spots during boiling. The epoxy disks remain wet and prevent merging bubbles during the pool boiling experiment and a 2-D microflow is induced toward dried regions with synergic effects of nanoporous surface absorption, create a considerable delay in the formation of a vapor blanket. The results indicate that the anodized surface enhances the critical heat flux (CHF) by 33% and the heat transfer coefficient increases by 48% at the CHF compared to the non-coated substrate. It has been shown that for anodized samples with 3 and 4 mm epoxy spot pitches the CHF equals to 144 and 133 W/cm2, respectively, considerably higher than the coated surface without epoxy parts 125 W/cm2.

中文翻译：

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使用环氧树脂点增强池沸腾在超亲水纳米多孔基材上产生二维微流

摘要 我们对去离子水在纳米多孔表面上的池沸腾增强进行了实验研究。通过阳极氧化对表面进行改性，并使用 EDM 方法在其上应用直径为 2 毫米、节距为 2.5 至 5 毫米的腔体，其中填充有低导热性能的两部分环氧树脂。超亲水纳米多孔氧化物层的毛细管芯吸作用增强了液体在沸腾过程中的再润湿和扩散到干点。环氧树脂盘在池沸腾实验期间保持湿润并防止合并气泡，并且二维微流被诱导到干燥区域，具有纳米多孔表面吸收的协同效应，在蒸汽毯的形成过程中产生相当大的延迟。结果表明，与未涂层基材相比，阳极氧化表面将临界热通量 (CHF) 提高了 33%，并且在 CHF 下传热系数增加了 48%。已经表明，对于具有 3 和 4 毫米环氧树脂点间距的阳极氧化样品，CHF 分别等于 144 和 133 W/cm2，远高于没有环氧树脂部件的涂层表面 125 W/cm2。