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Nucleate boiling performance on nano/microstructures with different wetting surfaces

机译:具有不同润湿表面的纳米/微结构上的核沸腾性能

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摘要

A study of nucleate boiling phenomena on nano/microstructures is a very basic and useful study with a view to the potential application of modified surfaces as heating surfaces in a number of fields. We present a detailed study of boiling experiments on fabricated nano/microstructured surfaces used as heating surfaces under atmospheric conditions, employing identical nanostructures with two different wettabilities (silicon-oxidized and Teflon-coated). Consequently, enhancements of both boiling heat transfer (BHT) and critical heat flux (CHF) are demonstrated in the nano/microstructures, independent of their wettability. However, the increment of BHT and CHF on each of the different wetting surfaces depended on the wetting characteristics of heating surfaces. The effect of water penetration in the surface structures by capillary phenomena is suggested as a plausible mechanism for the enhanced CHF on the nano/microstructures regardless of the wettability of the surfaces in atmospheric condition. This is supported by comparing bubble shapes generated in actual boiling experiments and dynamic contact angles under atmospheric conditions on Teflon-coated nano/microstructured surfaces.
机译:纳米/微结构上成核沸腾现象的研究是一项非常基础和有用的研究,以期将改性表面作为加热表面在许多领域中的潜在应用。我们提供了在大气条件下用作加热表面的纳米/微结构化表面的沸腾实验的详细研究,采用具有两种不同润湿性的相同纳米结构(氧化硅和聚四氟乙烯涂层)。因此,在纳米/微结构中证明了沸腾传热(BHT)和临界热通量(CHF)的增强,而与它们的润湿性无关。然而,在每个不同的润湿表面上的BHT和CHF的增量取决于加热表面的润湿特性。建议通过毛细管现象使水渗透到表面结构中,这是在纳米/微结构上提高CHF的合理机制,而与大气条件下表面的润湿性无关。通过比较在实际沸腾实验中产生的气泡形状和在大气条件下在特氟隆涂层的纳米/微结构表面上的动态接触角来支持这一点。

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