https://scholars.lib.ntu.edu.tw/handle/123456789/598160
標題: | Re-touch rebound patterns and contact time for a droplet impacting a superhydrophobic cylinder | 作者: | Zhang L.-Z Wang Y.-B Gao S.-R Lin D.-J Yang Y.-R Wang X.-D Lee D.-J. DUU-JONG LEE |
關鍵字: | Contact time;Cylinder;Droplet;Impact;Re-touch;Cylinders (shapes);Superhydrophobicity;Combined parameter;Droplet impact;Droplet spreading;Flat surfaces;Lattice Boltzmann method;Power-law correlations;Radius ratio;Weber numbers;Drop formation | 公開日期: | 2021 | 卷: | 126 | 起(迄)頁: | 359-370 | 來源出版物: | Journal of the Taiwan Institute of Chemical Engineers | 摘要: | Background: Droplet impact on a superhydrophobic cylinder differs from that on a flat surface. After bouncing, once re-touch takes place, the contact time τc would increase, which is unfavorable for some applications. The increased τc may strongly depend on the Weber number and radius ratio, R*, of cylinder to droplet. Methods: The impact is investigated via lattice Boltzmann method simulations. The particular emphasis is placed on re-touch rebound patterns and τc. Significant findings: Rebound patterns and τc both strongly depend on a combined parameter, α=We/R*, characterizing the asymmetry of droplet spreading and retraction. As α increases, upward rebound and stretched breakup take place sequentially for the first bouncing, whereas rebound patterns change as intact re-touch rebound and separate re-touch rebound for the second bouncing. Increasing α enhances the asymmetry, which promotes the first rebound, thereby reducing τc regardless of rebound patterns. The enhanced asymmetry also accelerates rebound and thus reduces τc in the separate re-touch rebound regime, whereas it hinders rebound, leading to a significantly increased τc. The power-law correlations of τc vs α are developed for the first and second bouncing. Besides, a method is proposed to suppress or prevent the re-touch, which is proven to effectively reduce τc. ? 2021 Taiwan Institute of Chemical Engineers |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111309159&doi=10.1016%2fj.jtice.2021.07.012&partnerID=40&md5=94f792cfa9fec51e276bdd78d1dc8e07 https://scholars.lib.ntu.edu.tw/handle/123456789/598160 |
ISSN: | 18761070 | DOI: | 10.1016/j.jtice.2021.07.012 |
顯示於: | 化學工程學系 |
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