https://scholars.lib.ntu.edu.tw/handle/123456789/638851
標題: | Sliding motion of highly deformed droplets on smooth and rough surfaces: Shape oscillation, chaotic breakage, corner shape, and pearling | 作者: | Tsao, Yu Hao YING-CHIH LIAO Tsao, Heng Kwong |
公開日期: | 1-十二月-2023 | 卷: | 35 | 期: | 12 | 來源出版物: | Physics of Fluids | 摘要: | The sliding behavior of droplets on smooth and rough surfaces with various surface wettabilities is investigated by many-body dissipative particle dynamics simulations. On a smooth surface, as the driving force ( B o ) increases, the droplet shape and velocity ( C a c ) before breakage can be classified into four distinct regimes: (I) nearly spherical cap with C a c ∝ B o ; (II) oval shape with negative deviation from the linear relation; (III) elongated shape without a neck, where C a c decreases with increasing B o ; and (IV) oscillation of an elongated shape with fluctuating sliding velocity. On rough surfaces, corner-shaped droplets, which are absent on a smooth surface, can be observed. A further increase in B o leads to the formation of cusp and pearling. Different from pinching-off on rough surfaces, which produces a cascade of smaller droplets through groove-induced shedding, chaotic breakage of a droplet on a smooth surface is caused by an unsteady flow field. Finally, a universal linear relationship between the sliding velocity based on the surface velocity ( C a s ) and the modified driving force ( B o * * ) is derived to take into account the effects of surface wettability and roughness. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/638851 | ISSN: | 10706631 | DOI: | 10.1063/5.0181630 |
顯示於: | 化學工程學系 |
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