https://scholars.lib.ntu.edu.tw/handle/123456789/598296
標題: | Imbibition dynamics in an open-channel capillary with holes | 作者: | He G.-Y Tsao H.-K Sheng Y.-J. YU-JANE SHENG |
關鍵字: | Channel with holes;Imbibition dynamics;Phase diagram;Two-rail open channel;Washburn's equation;Free energy;Open channel flow;Capillary imbibition;Channel height;Channel widths;Channel with hole;Hole size;Imbibition dynamic;Imbibition process;Open channels;Washburn equation;Phase diagrams | 公開日期: | 2022 | 卷: | 349 | 來源出版物: | Journal of Molecular Liquids | 摘要: | Spontaneous capillary flow is generally described by Washburn's equation. However, the modification must be made for imbibition dynamics in an open channel. Moreover, the presence of the holes in the capillary for flow division or bifurcation complicates the outcome of the imbibition process. In this work, capillary imbibition into a two-rail channel with/without holes is investigated by many-body dissipative particle dynamics (MDPD). The influences of channel height (h), channel width (w), hole size (wh), and surface wettability (θY) on the imbibition rate are examined. For two-rail channel without holes, the simulation results agree reasonably with Washburn's equation with the correction 1-(h/w)/cosθY. The penetration rate grows with reducing the channel height or enlarging the channel width. However, in the presence of holes, the wicking dynamics is slowed down and four types of outcomes are observed: “covering”, “separation”, “pass/stop”, and “stoppage”. These states depend on the size and (symmetric or asymmetric) position of the rectangular hole. Finally, the phase diagrams which vary with θY, wh/h, and w/h are constructed. The domains of those states agree reasonably with the equations acquired simply from the analyses of surface free energy. ? 2021 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120506673&doi=10.1016%2fj.molliq.2021.118117&partnerID=40&md5=c22ee7f14b0a709f7aead53974b39945 https://scholars.lib.ntu.edu.tw/handle/123456789/598296 |
ISSN: | 01677322 | DOI: | 10.1016/j.molliq.2021.118117 |
顯示於: | 化學工程學系 |
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