The effect of surface roughness on sessile droplet evaporation dynamics of silica nanofluid

Zhang, Zhihao; Yan, Yuying

Abstract

This study focuses on the influence of copper surface roughness on evaporation dynamics and deposition mode of fixed silica nanofluid droplets. It aims to achieve an enhanced cooling effect based on silica nanofluid spray. The results show that roughness significantly impacts copper surface wettability. As roughness decreases, the evaporation lifetime of silica nanofluid droplets would be prolonged, by up to 75 %. Increasing the roughness will also increase the temperature of the droplet apex, and the temperature difference between the top of the droplet; the contact line area will also be reduced by up to 54 %, inhibiting the evaporative cooling effect. Roughness also significantly impacts the deposition pattern of nanofluid droplets. The coffee ring effect is produced on all kinds of surfaces. Still, the coffee ring effect is suppressed as the roughness increases, and the coffee ring deposition has a very small number of fractures on smooth surfaces with more minor roughness. In contrast, on rough surfaces, the number of fractures increases significantly. In summary, this experimental study reveals the critical influence of the roughness of copper, a widely used heat dissipation material, on the heat and mass transfer process and sedimentary pattern of silica nanofluid droplet evaporation.

Citation

Zhang, Z., & Yan, Y. (2024). The effect of surface roughness on sessile droplet evaporation dynamics of silica nanofluid. International Journal of Heat and Mass Transfer, 234, Article 126156. https://doi.org/10.1016/j.ijheatmasstransfer.2024.126156

• Journal Article Type: Article
• Acceptance Date: Aug 31, 2024
• Online Publication Date: Sep 4, 2024
• Publication Date: Dec 1, 2024
• Deposit Date: Sep 9, 2024
• Publicly Available Date: Sep 9, 2024
• Journal: International Journal of Heat and Mass Transfer
• Print ISSN: 0017-9310
• Electronic ISSN: 0017-9310
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 234
• Article Number: 126156
• DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2024.126156
• Public URL: https://nottingham-repository.worktribe.com/output/39177610
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0017931024009864