Experimental Investigation of TiO2/Water Nanofluid Droplet Impingement on Nanostructured Surfaces

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• 作者：Mostafa Kahani ; Robert Gordon Jackson ; Gary Rosengarten
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 24, 2016
• 年：2016
• 卷：55
• 期：7
• 页码：2230-2241
• 全文大小：938K
• ISSN：1520-5045

文摘

This paper presents the results of an experimental investigation of nanofluid droplets impacting on nanostructured surfaces. Nanofluids with required weight concentration of 0.25–0.75 wt % were prepared by dispersing TiO₂ (21 nm) nanoparticles and appropriate amounts of sodium dodecyl sulfate (SDS) surfactant in Milli-Q water. Superhydrophobic and superhydrophilic coatings were applied over a silicon substrate. The images obtained from the high-speed camera clearly show that when a nanofluid droplet impacts a superhydrophobic surface at room temperature, it spreads, retracts, oscillates, and continues to retract to approximately its initial size. In addition, the increase in nanofluid concentration leads to a decrease in the maximum spreading and the height of droplets after impingement. Also, the use of nanofluids increases the temperature difference at the center of the droplet impact region. TiO₂ nanoparticles improve the cooling effectiveness of the droplets on uncoated and superhydrophobic surface up to 33% and 214%, respectively.