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Effects of Carbon Nanohorn Based Nanofluids Pool Boiling on Optical Properties and Wettability of Different Metal Surfaces
Heat Transfer Engineering ( IF 2.3 ) Pub Date : 2020-09-16 , DOI: 10.1080/01457632.2020.1818407
Alexandra Gimeno-Furio 1 , Leonor Hernandez 1 , Simona Barison 2 , Filippo Agresti 2 , Gregorio Bottaro 3 , David Cabaleiro 4 , Luca Doretti 5 , Simone Mancin 6
Affiliation  

Abstract

Oxidized carbon nanohorn water based nanofluids are attracting more and more attention for solar harvesting applications because of their peculiar features: stable suspension without any surfactant, higher solar absorbance values as compared to the base fluid, etc. However, these nanofluids are still matter of research because not all their properties have been comprehensively studied yet. This paper is focused on the wettability properties of the carbon nanohorn water based nanofluids on different metal surfaces. The static contact angle was measured for ten nanofluids with concentrations ranging from 0.002%wt to 0.1% wt, five of those used non-oxidized carbon nanohorns while the other five used oxidized carbon nanohorns. Moreover, this work investigates a novel use of the oxidized carbon nanohorn nanofluids to deposit an ultra-thin layer via pool boiling. The realized coating was proved to be stable and found to slightly affect the wettability of the nanofluids. Finally, the solar reflectance of the coated aluminum sample was measured and found to be from 2 to 10 times lower as compared to a reference aluminum surface.



中文翻译:

基于碳纳米角的纳米流体池沸腾对不同金属表面光学性能和润湿性的影响

摘要

氧化碳纳米角水基纳米流体因其独特的特性而在太阳能收集应用中越来越受到关注:不含任何表面活性剂的稳定悬浮、与基液相比具有更高的太阳能吸收值等。然而,这些纳米流体仍然是研究的问题因为尚未对它们的所有特性进行全面研究。本文重点研究了碳纳米角水基纳米流体在不同金属表面的润湿性能。对浓度范围为 0.002%wt 至 0.1%wt 的十种纳米流体测量静态接触角,其中五种使用未氧化的碳纳米角,而其他五种使用氧化的碳纳米角。而且,这项工作研究了氧化碳纳米角纳米流体通过池沸腾沉积超薄层的新用途。实现的涂层被证明是稳定的,并发现轻微影响纳米流体的润湿性。最后,测量了涂覆铝样品的太阳光反射率,发现与参考铝表面相比,其低 2 至 10 倍。

更新日期:2020-09-16
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