Evaporation Characteristics and Morphological Evolutions of Fuel Droplets After Hitting Different Wettability Surfaces

Chen, Yanling; Guo, Liang; Cai, Ningning; Sun, Wanchen; Yan, Yuying; Li, Degang; Wang, Han; Xuan, Rong

Abstract

To solve the wall-wetting problem in internal combustion engines, the physical and chemical etching 11 methods are used to prepare different wettability surfaces with various microstructures. The evaporation 12 characteristics and morphological evolution processes of diesel and n-butanol droplets after hitting the various 13 surfaces are investigated. The results show that the surface microstructures increase the surface roughness (Ra), 14 enhancing the oleophilic property of the oleophilic surfaces. Compared to n-butanol droplets, the same surface 15 shows stronger oleophobicity to diesel droplets. When a droplet hits an oleophilic property surface with a lower 16 temperature, the stronger the oleophilicity, the shorter the evaporation time. For oleophilic surfaces, larger Ra leads to a higher Leidenfrost temperature (TLeid ). The low TLeid 17 caused by enhanced oleophobicity, dense 18 microstructures and increased convex dome height facilitates droplet rebound and promotes the evaporation of 19 the wall-impinging droplets into the cylinder. The evaporation rate of the droplets is not only related to the 20 characteristics of the solid surfaces and the fuel droplets but also affected by the heat transfer rate of the droplets 21 at different boiling regimes. The spreading diameter of a droplet on an oleophobic surface varies significantly 22 less with time than that on an oleophilic surface under the same surface temperature.

Citation

Chen, Y., Guo, L., Cai, N., Sun, W., Yan, Y., Li, D., Wang, H., & Xuan, R. (2023). Evaporation Characteristics and Morphological Evolutions of Fuel Droplets After Hitting Different Wettability Surfaces. Journal of Bionic Engineering, 20(2), 734-747. https://doi.org/10.1007/s42235-022-00293-y

• Journal Article Type: Article
• Acceptance Date: Oct 19, 2022
• Online Publication Date: Nov 28, 2022
• Publication Date: 2023-03
• Deposit Date: Oct 23, 2023
• Publicly Available Date: Nov 29, 2023
• Journal: Journal of Bionic Engineering
• Print ISSN: 1672-6529
• Electronic ISSN: 2543-2141
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 20
• Issue: 2
• Pages: 734-747
• DOI: https://doi.org/10.1007/s42235-022-00293-y
• Public URL: https://nottingham-repository.worktribe.com/output/26523007
• Publisher URL: https://link.springer.com/article/10.1007/s42235-022-00293-y
• Additional Information: This version of the article has been accepted for publication, after peer review but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://link.springer.com/article/10.1007/s42235-022-00293-y