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首页> 外文期刊>International Journal of Heat and Mass Transfer >Condensation heat transfer on nickel tubes: The role of atomic layer deposition of nickel oxide
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Condensation heat transfer on nickel tubes: The role of atomic layer deposition of nickel oxide

机译：镍管上的冷凝传热：氧化镍原子层沉积的作用

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摘要

The search for durable surfaces offering sustainable high rates of condensation is very essential for many applications. Most of the metal surfaces are subject to oxidization when exposed to water vapor and air, as is the case during the condensation under saturation conditions. Due to the relative stability of nickel and nickel oxide (NiO) among other common metals, they were considered herein as the substrates for condensing saturated water vapor under the atmospheric conditions. The main objective of this study was to investigate the influence of NiO layer(s) that would be formed during practical applications on the condensation performance. To mimic such oxide formation, different thicknesses of NiO layers were deposited by atomic layer deposition (ALD) method on the surface of smooth nickel tubes. The influence of the oxide layers on the condensation rate was then experimentally characterized, and the droplet dynamic was analyzed. Due to the presence of the large amount of hydrophobic carbon contents in the deposited NiO-ALD layers, especially at the initial stages of the ALD deposition process, a suitable wettability contrast degree with the corresponding deposited hydrophilic NiO was established. Thus bi-philic wettable surfaces were achieved. The degree of contrast in the wettability was varied by the number of the deposited NiO-ALD layers. It was found that samples with a higher carbon to NiO ratio exhibited a higher condensation heat transfer performance, reaching a maximum heat flux and heat transfer coefficient (HTC) of about 3.9 and 4.2 times that of the filmwise condensation (FWC) at subcooling temperatures of 11.0 degrees C and 3.5 degrees C, respectively. (C) 2018 Elsevier Ltd. All rights reserved.
机译：对于许多应用而言，寻找提供可持续高凝结率的耐用表面非常重要。当暴露在水蒸气和空气中时，大多数金属表面都会发生氧化，就像在饱和条件下冷凝时一样。由于镍和氧化镍（NiO）在其他常见金属中的相对稳定性，在本文中它们被视为在大气条件下冷凝饱和水蒸气的基质。这项研究的主要目的是研究在实际应用过程中会形成的NiO层对冷凝性能的影响。为了模拟这种氧化物的形成，通过原子层沉积（ALD）方法在光滑的镍管表面上沉积了不同厚度的NiO层。然后通过实验表征了氧化物层对冷凝速率的影响，并分析了液滴动态。由于在沉积的NiO-ALD层中存在大量的疏水碳，尤其是在ALD沉积过程的初始阶段，与相应的沉积的亲水性NiO建立了合适的润湿性对比度。因此获得了双亲性可湿性表面。润湿性的对比程度随沉积的NiO-ALD层数而变化。结果发现，碳/ NiO含量较高的样品表现出较高的冷凝热传递性能，在过冷温度为200°C时，其最大热通量和热传递系数（HTC）约为薄膜冷凝（FWC）的3.9和4.2倍。分别为11.0摄氏度和3.5摄氏度。 （C）2018 Elsevier Ltd.保留所有权利。

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